51492977640 has 128 divisors (see below), whose sum is σ = 184846636800. Its totient is φ = 12675191040.

The previous prime is 51492977639. The next prime is 51492977689. The reversal of 51492977640 is 4677929415.

51492977640 is a `hidden beast` number, since 5 + 1 + 492 + 97 + 7 + 64 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

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 31 ways as a sum of consecutive naturals, for example, 1819756 + ... + 1847835.

It is an arithmetic number, because the mean of its divisors is an integer number (1444114350).

Almost surely, 2^51492977640 is an apocalyptic number.

It is an amenable number.

51492977640 is an abundant number, since it is smaller than the sum of its proper divisors (133353659160).

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

51492977640 is a wasteful number, since it uses less digits than its factorization.

51492977640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3667624 (or 3667614 counting only the distinct ones).

The product of its (nonzero) digits is 3810240, while the sum is 54.

The spelling of 51492977640 in words is "fifty-one billion, four hundred ninety-two million, nine hundred seventy-seven thousand, six hundred forty".