51657431330 has 32 divisors (see below), whose sum is σ = 94436118000. Its totient is φ = 20342597632.

The previous prime is 51657431323. The next prime is 51657431333. The reversal of 51657431330 is 3313475615.

It can be written as a sum of positive squares in 8 ways, for example, as 1901221609 + 49756209721 = 43603^2 + 223061^2 .

It is a super-2 number, since 2×51657431330² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51657431333) 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, 14966 + ... + 321774.

Almost surely, 2^51657431330 is an apocalyptic number.

51657431330 is a deficient number, since it is larger than the sum of its proper divisors (42778686670).

51657431330 is a wasteful number, since it uses less digits than its factorization.

51657431330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307078.

The product of its (nonzero) digits is 113400, while the sum is 38.

The spelling of 51657431330 in words is "fifty-one billion, six hundred fifty-seven million, four hundred thirty-one thousand, three hundred thirty".