51897523842 has 12 divisors (see below), whose sum is σ = 112444635030. Its totient is φ = 17299174608.

The previous prime is 51897523813. The next prime is 51897523877. The reversal of 51897523842 is 24832579815.

51897523842 is a `hidden beast` number, since 518 + 9 + 7 + 52 + 38 + 42 = 666.

It can be written as a sum of positive squares in only one way, i.e., 50001879321 + 1895644521 = 223611^2 + 43539^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1441597867 + ... + 1441597902.

Almost surely, 2^51897523842 is an apocalyptic number.

51897523842 is an abundant number, since it is smaller than the sum of its proper divisors (60547111188).

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

51897523842 is a wasteful number, since it uses less digits than its factorization.

51897523842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2883195777 (or 2883195774 counting only the distinct ones).

The product of its digits is 4838400, while the sum is 54.

The spelling of 51897523842 in words is "fifty-one billion, eight hundred ninety-seven million, five hundred twenty-three thousand, eight hundred forty-two".