51655865420 has 24 divisors (see below), whose sum is σ = 108626560224. Its totient is φ = 20633918976.

The previous prime is 51655865413. The next prime is 51655865461. The reversal of 51655865420 is 2456855615.

51655865420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1761797 + ... + 1790876.

It is an arithmetic number, because the mean of its divisors is an integer number (4526106676).

Almost surely, 2^51655865420 is an apocalyptic number.

It is an amenable number.

51655865420 is an abundant number, since it is smaller than the sum of its proper divisors (56970694804).

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

51655865420 is a wasteful number, since it uses less digits than its factorization.

51655865420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3553409 (or 3553407 counting only the distinct ones).

The product of its (nonzero) digits is 1440000, while the sum is 47.

The spelling of 51655865420 in words is "fifty-one billion, six hundred fifty-five million, eight hundred sixty-five thousand, four hundred twenty".