55651515 has 32 divisors (see below), whose sum is σ = 92093760. Its totient is φ = 28675584.

The previous prime is 55651499. The next prime is 55651529. The reversal of 55651515 is 51515655.

It is not a de Polignac number, because 55651515 - 2⁴ = 55651499 is a prime.

It is a super-2 number, since 2×55651515² = 6194182243590450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 109081 + ... + 109589.

It is an arithmetic number, because the mean of its divisors is an integer number (2877930).

Almost surely, 2^55651515 is an apocalyptic number.

55651515 is a deficient number, since it is larger than the sum of its proper divisors (36442245).

55651515 is a wasteful number, since it uses less digits than its factorization.

55651515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 751.

The product of its digits is 18750, while the sum is 33.

The square root of 55651515 is about 7459.9943029469. The cubic root of 55651515 is about 381.7909801019.

The spelling of 55651515 in words is "fifty-five million, six hundred fifty-one thousand, five hundred fifteen".