255667581 has 12 divisors (see below), whose sum is σ = 397705308. Its totient is φ = 157333824.

The previous prime is 255667579. The next prime is 255667583. The reversal of 255667581 is 185766552.

255667581 is a `hidden beast` number, since 2 + 5 + 5 + 6 + 67 + 581 = 666.

It is an interprime number because it is at equal distance from previous prime (255667579) and next prime (255667583).

It can be written as a sum of positive squares in 2 ways, for example, as 130988025 + 124679556 = 11445^2 + 11166^2 .

It is not a de Polignac number, because 255667581 - 2¹ = 255667579 is a prime.

It is a super-2 number, since 2×255667581² = 130731823948783122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255667583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1092480 + ... + 1092713.

It is an arithmetic number, because the mean of its divisors is an integer number (33142109).

Almost surely, 2^255667581 is an apocalyptic number.

It is an amenable number.

255667581 is a deficient number, since it is larger than the sum of its proper divisors (142037727).

255667581 is a wasteful number, since it uses less digits than its factorization.

255667581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2185212 (or 2185209 counting only the distinct ones).

The product of its digits is 504000, while the sum is 45.

The square root of 255667581 is about 15989.6085317934. The cubic root of 255667581 is about 634.6854672270.

The spelling of 255667581 in words is "two hundred fifty-five million, six hundred sixty-seven thousand, five hundred eighty-one".