255387402864 has 480 divisors, whose sum is σ = 836156006400. Its totient is φ = 71954749440.

The previous prime is 255387402859. The next prime is 255387402869. The reversal of 255387402864 is 468204783552.

255387402864 is a `hidden beast` number, since 2 + 5 + 538 + 7 + 40 + 2 + 8 + 64 = 666.

It is an interprime number because it is at equal distance from previous prime (255387402859) and next prime (255387402869).

It is a self number, because there is not a number n which added to its sum of digits gives 255387402864.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255387402869) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 416618622 + ... + 416619234.

It is an arithmetic number, because the mean of its divisors is an integer number (1741991680).

Almost surely, 2^255387402864 is an apocalyptic number.

255387402864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 255387402864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (418078003200).

255387402864 is an abundant number, since it is smaller than the sum of its proper divisors (580768603536).

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

255387402864 is a wasteful number, since it uses less digits than its factorization.

255387402864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 893 (or 884 counting only the distinct ones).

The product of its (nonzero) digits is 12902400, while the sum is 54.

The spelling of 255387402864 in words is "two hundred fifty-five billion, three hundred eighty-seven million, four hundred two thousand, eight hundred sixty-four".