55221507515 has 32 divisors (see below), whose sum is σ = 69552542400. Its totient is φ = 42051985920.

The previous prime is 55221507457. The next prime is 55221507557. The reversal of 55221507515 is 51570512255.

It is not a de Polignac number, because 55221507515 - 2³⁰ = 54147765691 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1410221 + ... + 1448849.

It is an arithmetic number, because the mean of its divisors is an integer number (2173516950).

Almost surely, 2^55221507515 is an apocalyptic number.

55221507515 is a deficient number, since it is larger than the sum of its proper divisors (14331034885).

55221507515 is a wasteful number, since it uses less digits than its factorization.

55221507515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38847.

The product of its (nonzero) digits is 87500, while the sum is 38.

The spelling of 55221507515 in words is "fifty-five billion, two hundred twenty-one million, five hundred seven thousand, five hundred fifteen".