255386877631 has 4 divisors (see below), whose sum is σ = 258256393200. Its totient is φ = 252517362064.

The previous prime is 255386877623. The next prime is 255386877671. The reversal of 255386877631 is 136778683552.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 255386877631 - 2³ = 255386877623 is a prime.

It is a super-2 number, since 2×255386877631² (a number of 24 digits) contains 22 as substring.

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 255386877631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255386877671) 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, 1434757651 + ... + 1434757828.

It is an arithmetic number, because the mean of its divisors is an integer number (64564098300).

Almost surely, 2^255386877631 is an apocalyptic number.

255386877631 is a deficient number, since it is larger than the sum of its proper divisors (2869515569).

255386877631 is an equidigital number, since it uses as much as digits as its factorization.

255386877631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2869515568.

The product of its digits is 50803200, while the sum is 61.

The spelling of 255386877631 in words is "two hundred fifty-five billion, three hundred eighty-six million, eight hundred seventy-seven thousand, six hundred thirty-one".