255616651 has 4 divisors (see below), whose sum is σ = 255815032. Its totient is φ = 255418272.

The previous prime is 255616619. The next prime is 255616681. The reversal of 255616651 is 156616552.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 255616651 - 2⁵ = 255616619 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 255616651.

It is not an unprimeable number, because it can be changed into a prime (255616681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97245 + ... + 99838.

It is an arithmetic number, because the mean of its divisors is an integer number (63953758).

Almost surely, 2^255616651 is an apocalyptic number.

255616651 is a deficient number, since it is larger than the sum of its proper divisors (198381).

255616651 is a wasteful number, since it uses less digits than its factorization.

255616651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198380.

The product of its digits is 54000, while the sum is 37.

The square root of 255616651 is about 15988.0158556339. The cubic root of 255616651 is about 634.6433204710.

Subtracting from 255616651 its reverse (156616552), we obtain a palindrome (99000099).

The spelling of 255616651 in words is "two hundred fifty-five million, six hundred sixteen thousand, six hundred fifty-one".