51978529992 has 32 divisors (see below), whose sum is σ = 130012106400. Its totient is φ = 17317405824.

The previous prime is 51978529991. The next prime is 51978530041. The reversal of 51978529992 is 29992587915.

It is a happy number.

It is a Smith number, since the sum of its digits (66) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (51978529991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 499693 + ... + 594684.

It is an arithmetic number, because the mean of its divisors is an integer number (4062878325).

Almost surely, 2^51978529992 is an apocalyptic number.

It is an amenable number.

51978529992 is an abundant number, since it is smaller than the sum of its proper divisors (78033576408).

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

51978529992 is a wasteful number, since it uses less digits than its factorization.

51978529992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1096365 (or 1096361 counting only the distinct ones).

The product of its digits is 36741600, while the sum is 66.

The spelling of 51978529992 in words is "fifty-one billion, nine hundred seventy-eight million, five hundred twenty-nine thousand, nine hundred ninety-two".