255517656563 has 8 divisors (see below), whose sum is σ = 275182468848. Its totient is φ = 235854216864.

The previous prime is 255517656557. The next prime is 255517656577. The reversal of 255517656563 is 365656715552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 255517656563 - 2²⁶ = 255450547699 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 255517656499 and 255517656508.

It is not an unprimeable number, because it can be changed into a prime (255517656503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61145 + ... + 717477.

It is an arithmetic number, because the mean of its divisors is an integer number (34397808606).

Almost surely, 2^255517656563 is an apocalyptic number.

255517656563 is a deficient number, since it is larger than the sum of its proper divisors (19664812285).

255517656563 is a wasteful number, since it uses less digits than its factorization.

255517656563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686293.

The product of its digits is 28350000, while the sum is 56.

The spelling of 255517656563 in words is "two hundred fifty-five billion, five hundred seventeen million, six hundred fifty-six thousand, five hundred sixty-three".