51920963172 has 48 divisors (see below), whose sum is σ = 144964516480. Its totient is φ = 15975680544.

The previous prime is 51920963167. The next prime is 51920963173. The reversal of 51920963172 is 27136902915.

It is a happy number.

51920963172 is a `hidden beast` number, since 5 + 1 + 9 + 2 + 0 + 9 + 631 + 7 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (51920963173) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18488968 + ... + 18491775.

Almost surely, 2^51920963172 is an apocalyptic number.

51920963172 is a gapful number since it is divisible by the number (52) formed by its first and last digit.

It is an amenable number.

51920963172 is an abundant number, since it is smaller than the sum of its proper divisors (93043553308).

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

51920963172 is a wasteful number, since it uses less digits than its factorization.

51920963172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36980769 (or 36980761 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 45.

The spelling of 51920963172 in words is "fifty-one billion, nine hundred twenty million, nine hundred sixty-three thousand, one hundred seventy-two".