255227717721 has 32 divisors (see below), whose sum is σ = 346412851200. Its totient is φ = 167128064064.

The previous prime is 255227717683. The next prime is 255227717743. The reversal of 255227717721 is 127717722552.

It is not a de Polignac number, because 255227717721 - 2⁷ = 255227717593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (255227717021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29054896 + ... + 29063678.

It is an arithmetic number, because the mean of its divisors is an integer number (10825401600).

Almost surely, 2^255227717721 is an apocalyptic number.

It is an amenable number.

255227717721 is a deficient number, since it is larger than the sum of its proper divisors (91185133479).

255227717721 is a wasteful number, since it uses less digits than its factorization.

255227717721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9645.

The product of its digits is 960400, while the sum is 48.

The spelling of 255227717721 in words is "two hundred fifty-five billion, two hundred twenty-seven million, seven hundred seventeen thousand, seven hundred twenty-one".