61775750450765 has 8 divisors (see below), whose sum is σ = 79833277505688. Its totient is φ = 45619015717440.

The previous prime is 61775750450737. The next prime is 61775750450767. The reversal of 61775750450765 is 56705405757716.

61775750450765 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 12988794376009 + 48786956074756 = 3603997^2 + 6984766^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-61775750450765 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (65), and also a Moran number because the ratio is a prime number: 950396160781 = 61775750450765 / (6 + 1 + 7 + 7 + 5 + 7 + 5 + 0 + 4 + 5 + 0 + 7 + 6 + 5).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61775750450767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 475198080326 + ... + 475198080455.

It is an arithmetic number, because the mean of its divisors is an integer number (9979159688211).

Almost surely, 2^{61775750450765} is an apocalyptic number.

61775750450765 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

61775750450765 is a deficient number, since it is larger than the sum of its proper divisors (18057527054923).

61775750450765 is a wasteful number, since it uses less digits than its factorization.

61775750450765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 950396160799.

The product of its (nonzero) digits is 216090000, while the sum is 65.

The spelling of 61775750450765 in words is "sixty-one trillion, seven hundred seventy-five billion, seven hundred fifty million, four hundred fifty thousand, seven hundred sixty-five".