51251615215 has 16 divisors (see below), whose sum is σ = 65125142208. Its totient is φ = 38586226176.

The previous prime is 51251615209. The next prime is 51251615269.

51251615215 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 51251615215 - 2²¹ = 51249518063 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 15 ways as a sum of consecutive naturals, for example, 1645729 + ... + 1676581.

It is an arithmetic number, because the mean of its divisors is an integer number (4070321388).

Almost surely, 2^51251615215 is an apocalyptic number.

51251615215 is a deficient number, since it is larger than the sum of its proper divisors (13873526993).

51251615215 is a wasteful number, since it uses less digits than its factorization.

51251615215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50418.

The product of its digits is 15000, while the sum is 34.

The spelling of 51251615215 in words is "fifty-one billion, two hundred fifty-one million, six hundred fifteen thousand, two hundred fifteen".