51555855515 has 16 divisors (see below), whose sum is σ = 62589342816. Its totient is φ = 40764576000.

The previous prime is 51555855473. The next prime is 51555855521.

51555855515 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 51555855515 - 2³⁰ = 50482113691 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 198959 + ... + 377751.

It is an arithmetic number, because the mean of its divisors is an integer number (3911833926).

Almost surely, 2^51555855515 is an apocalyptic number.

51555855515 is a deficient number, since it is larger than the sum of its proper divisors (11033487301).

51555855515 is a wasteful number, since it uses less digits than its factorization.

51555855515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179470.

The product of its digits is 3125000, while the sum is 50.

The spelling of 51555855515 in words is "fifty-one billion, five hundred fifty-five million, eight hundred fifty-five thousand, five hundred fifteen".