51497979772 has 24 divisors (see below), whose sum is σ = 94887082640. Its totient is φ = 24388024320.

The previous prime is 51497979749. The next prime is 51497979781. The reversal of 51497979772 is 27797979415.

It is a junction number, because it is equal to n+sod(n) for n = 51497979698 and 51497979707.

It is a congruent number.

It is an unprimeable number.

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, 253372 + ... + 408892.

Almost surely, 2^51497979772 is an apocalyptic number.

It is an amenable number.

51497979772 is a deficient number, since it is larger than the sum of its proper divisors (43389102868).

51497979772 is a wasteful number, since it uses less digits than its factorization.

51497979772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159901 (or 159899 counting only the distinct ones).

The product of its digits is 70013160, while the sum is 67.

The spelling of 51497979772 in words is "fifty-one billion, four hundred ninety-seven million, nine hundred seventy-nine thousand, seven hundred seventy-two".