51256665404 has 36 divisors (see below), whose sum is σ = 104513287536. Its totient is φ = 21931487424.

The previous prime is 51256665401. The next prime is 51256665517. The reversal of 51256665404 is 40456665215.

It is a super-2 number, since 2×51256665404² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51256665401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 90992 + ... + 332855.

It is an arithmetic number, because the mean of its divisors is an integer number (2903146876).

Almost surely, 2^51256665404 is an apocalyptic number.

It is an amenable number.

51256665404 is an abundant number, since it is smaller than the sum of its proper divisors (53256622132).

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

51256665404 is a wasteful number, since it uses less digits than its factorization.

51256665404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424482 (or 424473 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 44.

The spelling of 51256665404 in words is "fifty-one billion, two hundred fifty-six million, six hundred sixty-five thousand, four hundred four".