255534675621 has 4 divisors (see below), whose sum is σ = 340712900832. Its totient is φ = 170356450412.

The previous prime is 255534675589. The next prime is 255534675677. The reversal of 255534675621 is 126576435552.

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 a cyclic number.

It is not a de Polignac number, because 255534675621 - 2⁵ = 255534675589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255534675421) 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, 42589112601 + ... + 42589112606.

It is an arithmetic number, because the mean of its divisors is an integer number (85178225208).

Almost surely, 2^255534675621 is an apocalyptic number.

It is an amenable number.

255534675621 is a deficient number, since it is larger than the sum of its proper divisors (85178225211).

255534675621 is an equidigital number, since it uses as much as digits as its factorization.

255534675621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85178225210.

The product of its digits is 7560000, while the sum is 51.

The spelling of 255534675621 in words is "two hundred fifty-five billion, five hundred thirty-four million, six hundred seventy-five thousand, six hundred twenty-one".