260657681 has 2 divisors, whose sum is σ = 260657682. Its totient is φ = 260657680.

The previous prime is 260657653. The next prime is 260657687. The reversal of 260657681 is 186756062.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196000000 + 64657681 = 14000^2 + 8041^2 .

It is a cyclic number.

It is not a de Polignac number, because 260657681 - 2¹⁰ = 260656657 is a prime.

It is a super-2 number, since 2×260657681² = 135884853328595522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (260657687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130328840 + 130328841.

It is an arithmetic number, because the mean of its divisors is an integer number (130328841).

Almost surely, 2^260657681 is an apocalyptic number.

It is an amenable number.

260657681 is a deficient number, since it is larger than the sum of its proper divisors (1).

260657681 is an equidigital number, since it uses as much as digits as its factorization.

260657681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 260657681 is about 16144.8964381937. The cubic root of 260657681 is about 638.7881372445.

The spelling of 260657681 in words is "two hundred sixty million, six hundred fifty-seven thousand, six hundred eighty-one".