51505515156 has 24 divisors (see below), whose sum is σ = 120185091040. Its totient is φ = 17167711392.

The previous prime is 51505515151. The next prime is 51505515181. The reversal of 51505515156 is 65151550515.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51505515151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 209655 + ... + 383361.

Almost surely, 2^51505515156 is an apocalyptic number.

It is an amenable number.

51505515156 is an abundant number, since it is smaller than the sum of its proper divisors (68679575884).

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

51505515156 is a wasteful number, since it uses less digits than its factorization.

51505515156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198423 (or 198421 counting only the distinct ones).

The product of its (nonzero) digits is 93750, while the sum is 39.

The spelling of 51505515156 in words is "fifty-one billion, five hundred five million, five hundred fifteen thousand, one hundred fifty-six".