51231052640 has 48 divisors (see below), whose sum is σ = 121060396800. Its totient is φ = 20487843840.

The previous prime is 51231052601. The next prime is 51231052657. The reversal of 51231052640 is 4625013215.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 734480 + ... + 801200.

It is an arithmetic number, because the mean of its divisors is an integer number (2522091600).

Almost surely, 2^51231052640 is an apocalyptic number.

It is an amenable number.

51231052640 is an abundant number, since it is smaller than the sum of its proper divisors (69829344160).

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

51231052640 is a wasteful number, since it uses less digits than its factorization.

51231052640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71535 (or 71527 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 51231052640 its reverse (4625013215), we get a palindrome (55856065855).

The spelling of 51231052640 in words is "fifty-one billion, two hundred thirty-one million, fifty-two thousand, six hundred forty".