51516556165650 has 48 divisors (see below), whose sum is σ = 127765586095200. Its totient is φ = 13737261557760.

The previous prime is 51516556165603. The next prime is 51516556165687. The reversal of 51516556165650 is 5656165561515.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1826920 + ... + 10313619.

It is an arithmetic number, because the mean of its divisors is an integer number (2661783043650).

Almost surely, 2^{51516556165650} is an apocalyptic number.

51516556165650 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

51516556165650 is an abundant number, since it is smaller than the sum of its proper divisors (76249029929550).

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

51516556165650 is a wasteful number, since it uses less digits than its factorization.

51516556165650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12168843 (or 12168838 counting only the distinct ones).

The product of its (nonzero) digits is 20250000, while the sum is 57.

The spelling of 51516556165650 in words is "fifty-one trillion, five hundred sixteen billion, five hundred fifty-six million, one hundred sixty-five thousand, six hundred fifty".