2680991869 has 2 divisors, whose sum is σ = 2680991870. Its totient is φ = 2680991868.

The previous prime is 2680991861. The next prime is 2680991891. The reversal of 2680991869 is 9681990862.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2481334969 + 199656900 = 49813^2 + 14130^2 .

It is a cyclic number.

It is not a de Polignac number, because 2680991869 - 2³ = 2680991861 is a prime.

It is a super-2 number, since 2×2680991869² = 14375434803288226322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2680991861) 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 as a sum of consecutive naturals, namely, 1340495934 + 1340495935.

It is an arithmetic number, because the mean of its divisors is an integer number (1340495935).

Almost surely, 2^2680991869 is an apocalyptic number.

It is an amenable number.

2680991869 is a deficient number, since it is larger than the sum of its proper divisors (1).

2680991869 is an equidigital number, since it uses as much as digits as its factorization.

2680991869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3359232, while the sum is 58.

The square root of 2680991869 is about 51778.2953466025. The cubic root of 2680991869 is about 1389.2012506336.

The spelling of 2680991869 in words is "two billion, six hundred eighty million, nine hundred ninety-one thousand, eight hundred sixty-nine".