255815561403 has 12 divisors (see below), whose sum is σ = 371724011568. Its totient is φ = 169522486800.

The previous prime is 255815561401. The next prime is 255815561437. The reversal of 255815561403 is 304165518552.

255815561403 is a `hidden beast` number, since 2 + 5 + 5 + 81 + 5 + 561 + 4 + 0 + 3 = 666.

It is not a de Polignac number, because 255815561403 - 2¹ = 255815561401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (255815561401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 85100148 + ... + 85103153.

It is an arithmetic number, because the mean of its divisors is an integer number (30977000964).

Almost surely, 2^255815561403 is an apocalyptic number.

255815561403 is a deficient number, since it is larger than the sum of its proper divisors (115908450165).

255815561403 is a wasteful number, since it uses less digits than its factorization.

255815561403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170203474 (or 170203471 counting only the distinct ones).

The product of its (nonzero) digits is 720000, while the sum is 45.

The spelling of 255815561403 in words is "two hundred fifty-five billion, eight hundred fifteen million, five hundred sixty-one thousand, four hundred three".