61910607145 has 4 divisors (see below), whose sum is σ = 74292728580. Its totient is φ = 49528485712.

The previous prime is 61910607119. The next prime is 61910607163. The reversal of 61910607145 is 54170601916.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25372666944 + 36537940201 = 159288^2 + 191149^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61910607145 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 61910607098 and 61910607107.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6191060710 + ... + 6191060719.

It is an arithmetic number, because the mean of its divisors is an integer number (18573182145).

Almost surely, 2^61910607145 is an apocalyptic number.

It is an amenable number.

61910607145 is a deficient number, since it is larger than the sum of its proper divisors (12382121435).

61910607145 is a wasteful number, since it uses less digits than its factorization.

61910607145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12382121434.

The product of its (nonzero) digits is 45360, while the sum is 40.

The spelling of 61910607145 in words is "sixty-one billion, nine hundred ten million, six hundred seven thousand, one hundred forty-five".