255527872221 has 4 divisors (see below), whose sum is σ = 340703829632. Its totient is φ = 170351914812.

The previous prime is 255527872211. The next prime is 255527872267. The reversal of 255527872221 is 122278725552.

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.

It is not a de Polignac number, because 255527872221 - 2⁶ = 255527872157 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 (255527872211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42587978701 + ... + 42587978706.

It is an arithmetic number, because the mean of its divisors is an integer number (85175957408).

Almost surely, 2^255527872221 is an apocalyptic number.

It is an amenable number.

255527872221 is a deficient number, since it is larger than the sum of its proper divisors (85175957411).

255527872221 is an equidigital number, since it uses as much as digits as its factorization.

255527872221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85175957410.

The product of its digits is 1568000, while the sum is 48.

The spelling of 255527872221 in words is "two hundred fifty-five billion, five hundred twenty-seven million, eight hundred seventy-two thousand, two hundred twenty-one".