255667779 has 32 divisors (see below), whose sum is σ = 389504000. Its totient is φ = 165683232.

The previous prime is 255667771. The next prime is 255667829. The reversal of 255667779 is 977766552.

255667779 is a `hidden beast` number, since 2 + 5 + 566 + 7 + 7 + 79 = 666.

It is not a de Polignac number, because 255667779 - 2³ = 255667771 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (255667771) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 142017 + ... + 143805.

It is an arithmetic number, because the mean of its divisors is an integer number (12172000).

Almost surely, 2^255667779 is an apocalyptic number.

255667779 is a deficient number, since it is larger than the sum of its proper divisors (133836221).

255667779 is a wasteful number, since it uses less digits than its factorization.

255667779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1944 (or 1938 counting only the distinct ones).

The product of its digits is 5556600, while the sum is 54.

The square root of 255667779 is about 15989.6147233134. The cubic root of 255667779 is about 634.6856310696.

The spelling of 255667779 in words is "two hundred fifty-five million, six hundred sixty-seven thousand, seven hundred seventy-nine".