51561393641076 has 48 divisors (see below), whose sum is σ = 131340999283200. Its totient is φ = 15613496231520.

The previous prime is 51561393641063. The next prime is 51561393641081. The reversal of 51561393641076 is 67014639316515.

51561393641076 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 139420986 + ... + 139790321.

It is an arithmetic number, because the mean of its divisors is an integer number (2736270818400).

Almost surely, 2^{51561393641076} is an apocalyptic number.

It is an amenable number.

51561393641076 is an abundant number, since it is smaller than the sum of its proper divisors (79779605642124).

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

51561393641076 is a wasteful number, since it uses less digits than its factorization.

51561393641076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279212724 (or 279212722 counting only the distinct ones).

The product of its (nonzero) digits is 12247200, while the sum is 57.

The spelling of 51561393641076 in words is "fifty-one trillion, five hundred sixty-one billion, three hundred ninety-three million, six hundred forty-one thousand, seventy-six".