255593981951 has 16 divisors (see below), whose sum is σ = 324063694080. Its totient is φ = 195788474880.

The previous prime is 255593981947. The next prime is 255593981959. The reversal of 255593981951 is 159189395552.

It is a cyclic number.

It is not a de Polignac number, because 255593981951 - 2² = 255593981947 is a prime.

It is a super-2 number, since 2×255593981951² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255593981959) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28125986 + ... + 28135071.

It is an arithmetic number, because the mean of its divisors is an integer number (20253980880).

Almost surely, 2^255593981951 is an apocalyptic number.

255593981951 is a deficient number, since it is larger than the sum of its proper divisors (68469712129).

255593981951 is a wasteful number, since it uses less digits than its factorization.

255593981951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56261134.

The product of its digits is 21870000, while the sum is 62.

The spelling of 255593981951 in words is "two hundred fifty-five billion, five hundred ninety-three million, nine hundred eighty-one thousand, nine hundred fifty-one".