255560681 has 2 divisors, whose sum is σ = 255560682. Its totient is φ = 255560680.

The previous prime is 255560671. The next prime is 255560689. The reversal of 255560681 is 186065552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 216560656 + 39000025 = 14716^2 + 6245^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-255560681 is a prime.

It is a super-2 number, since 2×255560681² = 130622523346367522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (255560689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127780340 + 127780341.

It is an arithmetic number, because the mean of its divisors is an integer number (127780341).

Almost surely, 2^255560681 is an apocalyptic number.

It is an amenable number.

255560681 is a deficient number, since it is larger than the sum of its proper divisors (1).

255560681 is an equidigital number, since it uses as much as digits as its factorization.

255560681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72000, while the sum is 38.

The square root of 255560681 is about 15986.2653862620. The cubic root of 255560681 is about 634.5969964419.

It can be divided in two parts, 2555 and 60681, that added together give a palindrome (63236).

The spelling of 255560681 in words is "two hundred fifty-five million, five hundred sixty thousand, six hundred eighty-one".