2255645621 has 4 divisors (see below), whose sum is σ = 2255757600. Its totient is φ = 2255533644.

The previous prime is 2255645597. The next prime is 2255645641. The reversal of 2255645621 is 1265465522.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2255645621 - 2¹⁴ = 2255629237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2255645641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16481 + ... + 69158.

It is an arithmetic number, because the mean of its divisors is an integer number (563939400).

Almost surely, 2^2255645621 is an apocalyptic number.

It is an amenable number.

2255645621 is a deficient number, since it is larger than the sum of its proper divisors (111979).

2255645621 is an equidigital number, since it uses as much as digits as its factorization.

2255645621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111978.

The product of its digits is 144000, while the sum is 38.

The square root of 2255645621 is about 47493.6376896948. The cubic root of 2255645621 is about 1311.4657604312.

The spelling of 2255645621 in words is "two billion, two hundred fifty-five million, six hundred forty-five thousand, six hundred twenty-one".