55215055 has 8 divisors (see below), whose sum is σ = 75723552. Its totient is φ = 37861728.

The previous prime is 55215047. The next prime is 55215071. The reversal of 55215055 is 55051255.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55215055 - 2³ = 55215047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 788752 + ... + 788821.

It is an arithmetic number, because the mean of its divisors is an integer number (9465444).

Almost surely, 2^55215055 is an apocalyptic number.

55215055 is a deficient number, since it is larger than the sum of its proper divisors (20508497).

55215055 is a wasteful number, since it uses less digits than its factorization.

55215055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1577585.

The product of its (nonzero) digits is 6250, while the sum is 28.

The square root of 55215055 is about 7430.6833467724. The cubic root of 55215055 is about 380.7902644415.

The spelling of 55215055 in words is "fifty-five million, two hundred fifteen thousand, fifty-five".