51625621806 has 16 divisors (see below), whose sum is σ = 112637720448. Its totient is φ = 15644127800.

The previous prime is 51625621763. The next prime is 51625621813. The reversal of 51625621806 is 60812652615.

It is a super-2 number, since 2×51625621806² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

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, 391103130 + ... + 391103261.

It is an arithmetic number, because the mean of its divisors is an integer number (7039857528).

Almost surely, 2^51625621806 is an apocalyptic number.

51625621806 is an abundant number, since it is smaller than the sum of its proper divisors (61012098642).

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

51625621806 is a wasteful number, since it uses less digits than its factorization.

51625621806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782206407.

The product of its (nonzero) digits is 172800, while the sum is 42.

The spelling of 51625621806 in words is "fifty-one billion, six hundred twenty-five million, six hundred twenty-one thousand, eight hundred six".