51515011015 has 32 divisors (see below), whose sum is σ = 68570671680. Its totient is φ = 36906430464.

The previous prime is 51515010947. The next prime is 51515011033. The reversal of 51515011015 is 51011051515.

It is a cyclic number.

It is not a de Polignac number, because 51515011015 - 2¹⁷ = 51514879943 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 803671 + ... + 865399.

It is an arithmetic number, because the mean of its divisors is an integer number (2142833490).

Almost surely, 2^51515011015 is an apocalyptic number.

51515011015 is a deficient number, since it is larger than the sum of its proper divisors (17055660665).

51515011015 is a wasteful number, since it uses less digits than its factorization.

51515011015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62131.

The product of its (nonzero) digits is 625, while the sum is 25.

The spelling of 51515011015 in words is "fifty-one billion, five hundred fifteen million, eleven thousand, fifteen".