51660540660138 has 16 divisors (see below), whose sum is σ = 103323385510176. Its totient is φ = 17219796188400.

The previous prime is 51660540660059. The next prime is 51660540660181. The reversal of 51660540660138 is 83106604506615.

51660540660138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×51660540660138² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95716381 + ... + 96254592.

It is an arithmetic number, because the mean of its divisors is an integer number (6457711594386).

Almost surely, 2^{51660540660138} is an apocalyptic number.

51660540660138 is an abundant number, since it is smaller than the sum of its proper divisors (51662844850038).

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

51660540660138 is a wasteful number, since it uses less digits than its factorization.

51660540660138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192015829.

The product of its (nonzero) digits is 3110400, while the sum is 51.

The spelling of 51660540660138 in words is "fifty-one trillion, six hundred sixty billion, five hundred forty million, six hundred sixty thousand, one hundred thirty-eight".