2680646261 has 2 divisors, whose sum is σ = 2680646262. Its totient is φ = 2680646260.

The previous prime is 2680646231. The next prime is 2680646321. The reversal of 2680646261 is 1626460862.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1650878161 + 1029768100 = 40631^2 + 32090^2 .

It is a cyclic number.

It is not a de Polignac number, because 2680646261 - 2¹⁸ = 2680384117 is a prime.

It is a super-2 number, since 2×2680646261² = 14371728753226560242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2680646201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1340323130 + 1340323131.

It is an arithmetic number, because the mean of its divisors is an integer number (1340323131).

Almost surely, 2^2680646261 is an apocalyptic number.

It is an amenable number.

2680646261 is a deficient number, since it is larger than the sum of its proper divisors (1).

2680646261 is an equidigital number, since it uses as much as digits as its factorization.

2680646261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 165888, while the sum is 41.

The square root of 2680646261 is about 51774.9578560910. The cubic root of 2680646261 is about 1389.1415538594.

The spelling of 2680646261 in words is "two billion, six hundred eighty million, six hundred forty-six thousand, two hundred sixty-one".