255666187883520 has 440 divisors, whose sum is σ = 970055037140904. Its totient is φ = 64167198326784.

The previous prime is 255666187883489. The next prime is 255666187883647. The reversal of 255666187883520 is 25388781666552.

It can be written as a sum of positive squares in 4 ways, for example, as 55035507262464 + 200630680621056 = 7418592^2 + 14164416^2 .

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 11081497 + ... + 25181976.

Almost surely, 2^{255666187883520} is an apocalyptic number.

255666187883520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

255666187883520 is an abundant number, since it is smaller than the sum of its proper divisors (714388849257384).

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

255666187883520 is a wasteful number, since it uses less digits than its factorization.

255666187883520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36263527 (or 36263500 counting only the distinct ones).

The product of its (nonzero) digits is 1161216000, while the sum is 72.

The spelling of 255666187883520 in words is "two hundred fifty-five trillion, six hundred sixty-six billion, one hundred eighty-seven million, eight hundred eighty-three thousand, five hundred twenty".