51515066631 has 16 divisors (see below), whose sum is σ = 78562648064. Its totient is φ = 29413368864.

The previous prime is 51515066623. The next prime is 51515066641. The reversal of 51515066631 is 13666051515.

It is not a de Polignac number, because 51515066631 - 2³ = 51515066623 is a prime.

It is a super-2 number, since 2×51515066631² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51515066631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51515066621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 965575 + ... + 1017528.

It is an arithmetic number, because the mean of its divisors is an integer number (4910165504).

Almost surely, 2^51515066631 is an apocalyptic number.

51515066631 is a deficient number, since it is larger than the sum of its proper divisors (27047581433).

51515066631 is a wasteful number, since it uses less digits than its factorization.

51515066631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1984350.

The product of its (nonzero) digits is 81000, while the sum is 39.

The spelling of 51515066631 in words is "fifty-one billion, five hundred fifteen million, sixty-six thousand, six hundred thirty-one".