255661684 has 6 divisors (see below), whose sum is σ = 447407954. Its totient is φ = 127830840.

The previous prime is 255661673. The next prime is 255661697. The reversal of 255661684 is 486166552.

It can be written as a sum of positive squares in only one way, i.e., 169728784 + 85932900 = 13028^2 + 9270^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 255661684.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31957707 + ... + 31957714.

Almost surely, 2^255661684 is an apocalyptic number.

It is an amenable number.

255661684 is a deficient number, since it is larger than the sum of its proper divisors (191746270).

255661684 is a wasteful number, since it uses less digits than its factorization.

255661684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63915425 (or 63915423 counting only the distinct ones).

The product of its digits is 345600, while the sum is 43.

The square root of 255661684 is about 15989.4241297177. The cubic root of 255661684 is about 634.6805874935.

The spelling of 255661684 in words is "two hundred fifty-five million, six hundred sixty-one thousand, six hundred eighty-four".