55221765 has 8 divisors (see below), whose sum is σ = 88354848. Its totient is φ = 29451600.

The previous prime is 55221743. The next prime is 55221769. The reversal of 55221765 is 56712255.

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

It is not a de Polignac number, because 55221765 - 2⁶ = 55221701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55221769) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1840711 + ... + 1840740.

It is an arithmetic number, because the mean of its divisors is an integer number (11044356).

Almost surely, 2^55221765 is an apocalyptic number.

It is an amenable number.

55221765 is a deficient number, since it is larger than the sum of its proper divisors (33133083).

55221765 is a wasteful number, since it uses less digits than its factorization.

55221765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3681459.

The product of its digits is 21000, while the sum is 33.

The square root of 55221765 is about 7431.1348393095. The cubic root of 55221765 is about 380.8056889737.

The spelling of 55221765 in words is "fifty-five million, two hundred twenty-one thousand, seven hundred sixty-five".