51615605500 has 48 divisors (see below), whose sum is σ = 112750773408. Its totient is φ = 20642160000.

The previous prime is 51615605491. The next prime is 51615605507. The reversal of 51615605500 is 550651615.

It is a super-2 number, since 2×51615605500² (a number of 22 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51615605507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4614915 + ... + 4626085.

It is an arithmetic number, because the mean of its divisors is an integer number (2348974446).

Almost surely, 2^51615605500 is an apocalyptic number.

51615605500 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51615605500 is an abundant number, since it is smaller than the sum of its proper divisors (61135167908).

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

51615605500 is a wasteful number, since it uses less digits than its factorization.

51615605500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20431 (or 20419 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 34.

The spelling of 51615605500 in words is "fifty-one billion, six hundred fifteen million, six hundred five thousand, five hundred".