51865244256815 has 16 divisors (see below), whose sum is σ = 67944507449760. Its totient is φ = 37693406699520.

The previous prime is 51865244256799. The next prime is 51865244256829.

51865244256815 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 51865244256815 - 2⁴ = 51865244256799 is a prime.

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, 334558574 + ... + 334713563.

It is an arithmetic number, because the mean of its divisors is an integer number (4246531715610).

Almost surely, 2^{51865244256815} is an apocalyptic number.

51865244256815 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51865244256815 is a deficient number, since it is larger than the sum of its proper divisors (16079263192945).

51865244256815 is a wasteful number, since it uses less digits than its factorization.

51865244256815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669273562.

The product of its digits is 92160000, while the sum is 62.

The spelling of 51865244256815 in words is "fifty-one trillion, eight hundred sixty-five billion, two hundred forty-four million, two hundred fifty-six thousand, eight hundred fifteen".