51615251615 has 8 divisors (see below), whose sum is σ = 61940697408. Its totient is φ = 41290604320.

The previous prime is 51615251609. The next prime is 51615251647.

51615251615 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51615251615 - 2²⁸ = 51346816159 is a prime.

It is a Duffinian number.

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, 46772 + ... + 324681.

It is an arithmetic number, because the mean of its divisors is an integer number (7742587176).

Almost surely, 2^51615251615 is an apocalyptic number.

51615251615 is a deficient number, since it is larger than the sum of its proper divisors (10325445793).

51615251615 is a wasteful number, since it uses less digits than its factorization.

51615251615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399249.

The product of its digits is 45000, while the sum is 38.

The spelling of 51615251615 in words is "fifty-one billion, six hundred fifteen million, two hundred fifty-one thousand, six hundred fifteen".