51243604065 has 12 divisors (see below), whose sum is σ = 88822247124. Its totient is φ = 27329922144.

The previous prime is 51243604051. The next prime is 51243604073. The reversal of 51243604065 is 56040634215.

51243604065 is a `hidden beast` number, since 5 + 1 + 2 + 43 + 604 + 0 + 6 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 26817665121 + 24425938944 = 163761^2 + 156288^2 .

It is not a de Polignac number, because 51243604065 - 2⁷ = 51243603937 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 569373334 + ... + 569373423.

It is an arithmetic number, because the mean of its divisors is an integer number (7401853927).

Almost surely, 2^51243604065 is an apocalyptic number.

It is an amenable number.

51243604065 is a deficient number, since it is larger than the sum of its proper divisors (37578643059).

51243604065 is a wasteful number, since it uses less digits than its factorization.

51243604065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1138746768 (or 1138746765 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The spelling of 51243604065 in words is "fifty-one billion, two hundred forty-three million, six hundred four thousand, sixty-five".