255705977 has 4 divisors (see below), whose sum is σ = 255934800. Its totient is φ = 255477156.

The previous prime is 255705943. The next prime is 255706051. The reversal of 255705977 is 779507552.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 255705977 - 2¹² = 255701881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255705917) 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, 112727 + ... + 114972.

It is an arithmetic number, because the mean of its divisors is an integer number (63983700).

Almost surely, 2^255705977 is an apocalyptic number.

It is an amenable number.

255705977 is a deficient number, since it is larger than the sum of its proper divisors (228823).

255705977 is a wasteful number, since it uses less digits than its factorization.

255705977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228822.

The product of its (nonzero) digits is 771750, while the sum is 47.

The square root of 255705977 is about 15990.8091415038. The cubic root of 255705977 is about 634.7172378609.

The spelling of 255705977 in words is "two hundred fifty-five million, seven hundred five thousand, nine hundred seventy-seven".