51561660515010 has 96 divisors (see below), whose sum is σ = 127023615203328. Its totient is φ = 13394943072000.

The previous prime is 51561660514999. The next prime is 51561660515011. The reversal of 51561660515010 is 1051506616515.

It is a super-3 number, since 3×51561660515010³ (a number of 42 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51561660515011) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 20031510 + ... + 22458510.

It is an arithmetic number, because the mean of its divisors is an integer number (1323162658368).

Almost surely, 2^{51561660515010} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51561660515010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63511807601664).

51561660515010 is an abundant number, since it is smaller than the sum of its proper divisors (75461954688318).

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

51561660515010 is a wasteful number, since it uses less digits than its factorization.

51561660515010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2427480 (or 2427437 counting only the distinct ones).

The product of its (nonzero) digits is 135000, while the sum is 42.

The spelling of 51561660515010 in words is "fifty-one trillion, five hundred sixty-one billion, six hundred sixty million, five hundred fifteen thousand, ten".