255550174221 has 4 divisors (see below), whose sum is σ = 340733565632. Its totient is φ = 170366782812.

The previous prime is 255550174183. The next prime is 255550174267. The reversal of 255550174221 is 122471055552.

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 255550174221 - 2²¹ = 255548077069 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 255550174221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255550174291) 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, 42591695701 + ... + 42591695706.

It is an arithmetic number, because the mean of its divisors is an integer number (85183391408).

Almost surely, 2^255550174221 is an apocalyptic number.

It is an amenable number.

255550174221 is a deficient number, since it is larger than the sum of its proper divisors (85183391411).

255550174221 is an equidigital number, since it uses as much as digits as its factorization.

255550174221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85183391410.

The product of its (nonzero) digits is 140000, while the sum is 39.

The spelling of 255550174221 in words is "two hundred fifty-five billion, five hundred fifty million, one hundred seventy-four thousand, two hundred twenty-one".