255813977 has 4 divisors (see below), whose sum is σ = 270861876. Its totient is φ = 240766080.

The previous prime is 255813949. The next prime is 255813979. The reversal of 255813977 is 779318552.

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

It can be written as a sum of positive squares in 2 ways, for example, as 174741961 + 81072016 = 13219^2 + 9004^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-255813977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255813979) 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, 7523924 + ... + 7523957.

It is an arithmetic number, because the mean of its divisors is an integer number (67715469).

Almost surely, 2^255813977 is an apocalyptic number.

It is an amenable number.

255813977 is a deficient number, since it is larger than the sum of its proper divisors (15047899).

255813977 is a wasteful number, since it uses less digits than its factorization.

255813977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15047898.

The product of its digits is 529200, while the sum is 47.

The square root of 255813977 is about 15994.1857248189. The cubic root of 255813977 is about 634.8065850269.

The spelling of 255813977 in words is "two hundred fifty-five million, eight hundred thirteen thousand, nine hundred seventy-seven".