55221775 has 36 divisors (see below), whose sum is σ = 81069960. Its totient is φ = 37195200.

The previous prime is 55221769. The next prime is 55221821. The reversal of 55221775 is 57712255.

It is not a de Polignac number, because 55221775 - 2⁵ = 55221743 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55221775.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 74356 + ... + 75094.

Almost surely, 2^55221775 is an apocalyptic number.

55221775 is a deficient number, since it is larger than the sum of its proper divisors (25848185).

55221775 is a wasteful number, since it uses less digits than its factorization.

55221775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 824 (or 812 counting only the distinct ones).

The product of its digits is 24500, while the sum is 34.

The square root of 55221775 is about 7431.1355121542. The cubic root of 55221775 is about 380.8057119602.

The spelling of 55221775 in words is "fifty-five million, two hundred twenty-one thousand, seven hundred seventy-five".