255560665 has 8 divisors (see below), whose sum is σ = 314961480. Its totient is φ = 198922752.

The previous prime is 255560651. The next prime is 255560671. The reversal of 255560665 is 566065552.

It can be written as a sum of positive squares in 4 ways, for example, as 161315401 + 94245264 = 12701^2 + 9708^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 255560665 - 2²¹ = 253463513 is a prime.

It is a super-2 number, since 2×255560665² = 130622506990484450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 690520 + ... + 690889.

It is an arithmetic number, because the mean of its divisors is an integer number (39370185).

Almost surely, 2^255560665 is an apocalyptic number.

It is an amenable number.

255560665 is a deficient number, since it is larger than the sum of its proper divisors (59400815).

255560665 is a wasteful number, since it uses less digits than its factorization.

255560665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1381451.

The product of its (nonzero) digits is 270000, while the sum is 40.

The square root of 255560665 is about 15986.2648858325. The cubic root of 255560665 is about 634.5969831984.

The spelling of 255560665 in words is "two hundred fifty-five million, five hundred sixty thousand, six hundred sixty-five".