255699177408 has 140 divisors (see below), whose sum is σ = 758479099752. Its totient is φ = 85176092160.

The previous prime is 255699177407. The next prime is 255699177431. The reversal of 255699177408 is 804771996552.

255699177408 is a `hidden beast` number, since 2 + 5 + 56 + 9 + 9 + 177 + 408 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255699177407) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 8128366 + ... + 8159762.

Almost surely, 2^255699177408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 255699177408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (379239549876).

255699177408 is an abundant number, since it is smaller than the sum of its proper divisors (502779922344).

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

255699177408 is a wasteful number, since it uses less digits than its factorization.

255699177408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32992 (or 32973 counting only the distinct ones).

The product of its (nonzero) digits is 38102400, while the sum is 63.

The spelling of 255699177408 in words is "two hundred fifty-five billion, six hundred ninety-nine million, one hundred seventy-seven thousand, four hundred eight".