55115515 has 32 divisors (see below), whose sum is σ = 84228480. Its totient is φ = 33675264.

The previous prime is 55115507. The next prime is 55115527. The reversal of 55115515 is 51551155.

It is not a de Polignac number, because 55115515 - 2³ = 55115507 is a prime.

It is a nude number because it is divisible by every one of its digits.

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, 11107 + ... + 15283.

It is an arithmetic number, because the mean of its divisors is an integer number (2632140).

Almost surely, 2^55115515 is an apocalyptic number.

55115515 is a deficient number, since it is larger than the sum of its proper divisors (29112965).

55115515 is a wasteful number, since it uses less digits than its factorization.

55115515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4231.

The product of its digits is 3125, while the sum is 28.

The square root of 55115515 is about 7423.9824218542. The cubic root of 55115515 is about 380.5613011448.

It can be divided in two parts, 5511 and 5515, that added together give a triangular number (11026 = T₁₄₈).

The spelling of 55115515 in words is "fifty-five million, one hundred fifteen thousand, five hundred fifteen".