255767661 has 24 divisors (see below), whose sum is σ = 373837464. Its totient is φ = 168497280.

The previous prime is 255767627. The next prime is 255767663. The reversal of 255767661 is 166767552.

255767661 is a `hidden beast` number, since 2 + 5 + 576 + 76 + 6 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 32832900 + 222934761 = 5730^2 + 14931^2 .

It is not a de Polignac number, because 255767661 - 2⁶ = 255767597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255767663) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 320515 + ... + 321311.

It is an arithmetic number, because the mean of its divisors is an integer number (15576561).

Almost surely, 2^255767661 is an apocalyptic number.

It is an amenable number.

255767661 is a deficient number, since it is larger than the sum of its proper divisors (118069803).

255767661 is a wasteful number, since it uses less digits than its factorization.

255767661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1181 (or 1178 counting only the distinct ones).

The product of its digits is 529200, while the sum is 45.

The square root of 255767661 is about 15992.7377581201. The cubic root of 255767661 is about 634.7682714097.

The spelling of 255767661 in words is "two hundred fifty-five million, seven hundred sixty-seven thousand, six hundred sixty-one".