51643192520 has 32 divisors (see below), whose sum is σ = 119337651000. Its totient is φ = 20098971648.

The previous prime is 51643192507. The next prime is 51643192541. The reversal of 51643192520 is 2529134615.

It can be written as a sum of positive squares in 4 ways, for example, as 51067864324 + 575328196 = 225982^2 + 23986^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17445545 + ... + 17448504.

Almost surely, 2^51643192520 is an apocalyptic number.

It is an amenable number.

51643192520 is an abundant number, since it is smaller than the sum of its proper divisors (67694458480).

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

51643192520 is a wasteful number, since it uses less digits than its factorization.

51643192520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34894097 (or 34894093 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 38.

The spelling of 51643192520 in words is "fifty-one billion, six hundred forty-three million, one hundred ninety-two thousand, five hundred twenty".