51555615500 has 48 divisors (see below), whose sum is σ = 117493032384. Its totient is φ = 19725622400.

The previous prime is 51555615499. The next prime is 51555615511. The reversal of 51555615500 is 551655515.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2230049 + ... + 2253048.

It is an arithmetic number, because the mean of its divisors is an integer number (2447771508).

Almost surely, 2^51555615500 is an apocalyptic number.

51555615500 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51555615500 is an abundant number, since it is smaller than the sum of its proper divisors (65937416884).

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

51555615500 is a wasteful number, since it uses less digits than its factorization.

51555615500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4483139 (or 4483127 counting only the distinct ones).

The product of its (nonzero) digits is 93750, while the sum is 38.

The spelling of 51555615500 in words is "fifty-one billion, five hundred fifty-five million, six hundred fifteen thousand, five hundred".