255815561394 has 32 divisors (see below), whose sum is σ = 569181816000. Its totient is φ = 85166435232.

The previous prime is 255815561387. The next prime is 255815561401. The reversal of 255815561394 is 493165518552.

255815561394 is a `hidden beast` number, since 2 + 5 + 5 + 8 + 15 + 5 + 613 + 9 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (255815561387) and next prime (255815561401).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 255815561394.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2884204 + ... + 2971575.

It is an arithmetic number, because the mean of its divisors is an integer number (17786931750).

Almost surely, 2^255815561394 is an apocalyptic number.

255815561394 is an abundant number, since it is smaller than the sum of its proper divisors (313366254606).

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

255815561394 is a wasteful number, since it uses less digits than its factorization.

255815561394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5856599 (or 5856593 counting only the distinct ones).

The product of its digits is 6480000, while the sum is 54.

The spelling of 255815561394 in words is "two hundred fifty-five billion, eight hundred fifteen million, five hundred sixty-one thousand, three hundred ninety-four".