55055515 has 4 divisors (see below), whose sum is σ = 66066624. Its totient is φ = 44044408.

The previous prime is 55055479. The next prime is 55055569. The reversal of 55055515 is 51555055.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51555055 = 5 ⋅10311011.

It is a cyclic number.

It is not a de Polignac number, because 55055515 - 2⁷ = 55055387 is a prime.

It is a super-2 number, since 2×55055515² = 6062219463830450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5505547 + ... + 5505556.

It is an arithmetic number, because the mean of its divisors is an integer number (16516656).

Almost surely, 2^55055515 is an apocalyptic number.

55055515 is a deficient number, since it is larger than the sum of its proper divisors (11011109).

55055515 is a wasteful number, since it uses less digits than its factorization.

55055515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11011108.

The product of its (nonzero) digits is 15625, while the sum is 31.

The square root of 55055515 is about 7419.9403636417. The cubic root of 55055515 is about 380.4231551144.

It can be divided in two parts, 550 and 55515, that added together give a palindrome (56065).

The spelling of 55055515 in words is "fifty-five million, fifty-five thousand, five hundred fifteen".