55218375 has 32 divisors (see below), whose sum is σ = 102098880. Its totient is φ = 29448000.

The previous prime is 55218367. The next prime is 55218391. The reversal of 55218375 is 57381255.

It is not a de Polignac number, because 55218375 - 2³ = 55218367 is a prime.

It is a congruent number.

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, 4806 + ... + 11555.

It is an arithmetic number, because the mean of its divisors is an integer number (3190590).

Almost surely, 2^55218375 is an apocalyptic number.

55218375 is a deficient number, since it is larger than the sum of its proper divisors (46880505).

55218375 is a wasteful number, since it uses less digits than its factorization.

55218375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16385 (or 16369 counting only the distinct ones).

The product of its digits is 42000, while the sum is 36.

The square root of 55218375 is about 7430.9067414415. The cubic root of 55218375 is about 380.7978964080.

The spelling of 55218375 in words is "fifty-five million, two hundred eighteen thousand, three hundred seventy-five".