2009656679 has 2 divisors, whose sum is σ = 2009656680. Its totient is φ = 2009656678.

The previous prime is 2009656661. The next prime is 2009656711. The reversal of 2009656679 is 9766569002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2009656679 - 2²⁴ = 1992879463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2009655679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1004828339 + 1004828340.

It is an arithmetic number, because the mean of its divisors is an integer number (1004828340).

Almost surely, 2^2009656679 is an apocalyptic number.

2009656679 is a deficient number, since it is larger than the sum of its proper divisors (1).

2009656679 is an equidigital number, since it uses as much as digits as its factorization.

2009656679 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1224720, while the sum is 50.

The square root of 2009656679 is about 44829.1944942133. The cubic root of 2009656679 is about 1261.9455705489.

The spelling of 2009656679 in words is "two billion, nine million, six hundred fifty-six thousand, six hundred seventy-nine".