61891772752 has 20 divisors (see below), whose sum is σ = 119921387040. Its totient is φ = 30944318048.

The previous prime is 61891772749. The next prime is 61891772759. The reversal of 61891772752 is 25727719816.

It is a junction number, because it is equal to n+sod(n) for n = 61891772693 and 61891772702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61891772759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 269253 + ... + 443035.

It is an arithmetic number, because the mean of its divisors is an integer number (5996069352).

Almost surely, 2^61891772752 is an apocalyptic number.

It is an amenable number.

61891772752 is a deficient number, since it is larger than the sum of its proper divisors (58029614288).

61891772752 is a wasteful number, since it uses less digits than its factorization.

61891772752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196050 (or 196044 counting only the distinct ones).

The product of its digits is 2963520, while the sum is 55.

The spelling of 61891772752 in words is "sixty-one billion, eight hundred ninety-one million, seven hundred seventy-two thousand, seven hundred fifty-two".