51516015650 has 24 divisors (see below), whose sum is σ = 104530680144. Its totient is φ = 18733096400.

The previous prime is 51516015631. The next prime is 51516015659. The reversal of 51516015650 is 5651061515.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 51516015650.

It is not an unprimeable number, because it can be changed into a prime (51516015659) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46832192 + ... + 46833291.

It is an arithmetic number, because the mean of its divisors is an integer number (4355445006).

Almost surely, 2^51516015650 is an apocalyptic number.

51516015650 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

51516015650 is an abundant number, since it is smaller than the sum of its proper divisors (53014664494).

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

51516015650 is a wasteful number, since it uses less digits than its factorization.

51516015650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93665506 (or 93665501 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 35.

The spelling of 51516015650 in words is "fifty-one billion, five hundred sixteen million, fifteen thousand, six hundred fifty".