255577123644 has 12 divisors (see below), whose sum is σ = 596346621864. Its totient is φ = 85192374544.

The previous prime is 255577123561. The next prime is 255577123649. The reversal of 255577123644 is 446321775552.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×255577123644² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255577123649) 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, 10649046807 + ... + 10649046830.

It is an arithmetic number, because the mean of its divisors is an integer number (49695551822).

Almost surely, 2^255577123644 is an apocalyptic number.

It is an amenable number.

255577123644 is an abundant number, since it is smaller than the sum of its proper divisors (340769498220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

255577123644 is a wasteful number, since it uses less digits than its factorization.

255577123644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21298093644 (or 21298093642 counting only the distinct ones).

The product of its digits is 7056000, while the sum is 51.

The spelling of 255577123644 in words is "two hundred fifty-five billion, five hundred seventy-seven million, one hundred twenty-three thousand, six hundred forty-four".