51265656215 has 4 divisors (see below), whose sum is σ = 61518787464. Its totient is φ = 41012524968.

The previous prime is 51265656187. The next prime is 51265656241.

51265656215 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51265656215 - 2¹⁶ = 51265590679 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 3 ways as a sum of consecutive naturals, for example, 5126565617 + ... + 5126565626.

It is an arithmetic number, because the mean of its divisors is an integer number (15379696866).

Almost surely, 2^51265656215 is an apocalyptic number.

51265656215 is a deficient number, since it is larger than the sum of its proper divisors (10253131249).

51265656215 is a wasteful number, since it uses less digits than its factorization.

51265656215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10253131248.

The product of its digits is 540000, while the sum is 44.

The spelling of 51265656215 in words is "fifty-one billion, two hundred sixty-five million, six hundred fifty-six thousand, two hundred fifteen".