51497979774 has 32 divisors (see below), whose sum is σ = 109984573440. Its totient is φ = 16039413600.

The previous prime is 51497979749. The next prime is 51497979781. The reversal of 51497979774 is 47797979415.

It is a junction number, because it is equal to n+sod(n) for n = 51497979699 and 51497979708.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4768242 + ... + 4779029.

It is an arithmetic number, because the mean of its divisors is an integer number (3437017920).

Almost surely, 2^51497979774 is an apocalyptic number.

51497979774 is an abundant number, since it is smaller than the sum of its proper divisors (58486593666).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51497979774 is a wasteful number, since it uses less digits than its factorization.

51497979774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9547336.

The product of its digits is 140026320, while the sum is 69.

The spelling of 51497979774 in words is "fifty-one billion, four hundred ninety-seven million, nine hundred seventy-nine thousand, seven hundred seventy-four".