51991941976 has 32 divisors (see below), whose sum is σ = 111159246240. Its totient is φ = 22584734208.

The previous prime is 51991941971. The next prime is 51991942031. The reversal of 51991941976 is 67914919915.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51991941971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14701836 + ... + 14705371.

It is an arithmetic number, because the mean of its divisors is an integer number (3473726445).

Almost surely, 2^51991941976 is an apocalyptic number.

It is an amenable number.

51991941976 is an abundant number, since it is smaller than the sum of its proper divisors (59167304264).

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

51991941976 is a wasteful number, since it uses less digits than its factorization.

51991941976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29407243 (or 29407239 counting only the distinct ones).

The product of its digits is 5511240, while the sum is 61.

The spelling of 51991941976 in words is "fifty-one billion, nine hundred ninety-one million, nine hundred forty-one thousand, nine hundred seventy-six".