51681437352 has 48 divisors (see below), whose sum is σ = 140571337140. Its totient is φ = 17153203968.

The previous prime is 51681437329. The next prime is 51681437387. The reversal of 51681437352 is 25373418615.

It is a happy number.

51681437352 is a `hidden beast` number, since 5 + 168 + 1 + 437 + 3 + 52 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 48279515076 + 3401922276 = 219726^2 + 58326^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51681437298 and 51681437307.

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 11 ways as a sum of consecutive naturals, for example, 1523563 + ... + 1557114.

Almost surely, 2^51681437352 is an apocalyptic number.

It is an amenable number.

51681437352 is an abundant number, since it is smaller than the sum of its proper divisors (88889899788).

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

51681437352 is a wasteful number, since it uses less digits than its factorization.

51681437352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3080922 (or 3080915 counting only the distinct ones).

The product of its digits is 604800, while the sum is 45.

The spelling of 51681437352 in words is "fifty-one billion, six hundred eighty-one million, four hundred thirty-seven thousand, three hundred fifty-two".