2656699979 has 2 divisors, whose sum is σ = 2656699980. Its totient is φ = 2656699978.

The previous prime is 2656699951. The next prime is 2656700113. The reversal of 2656699979 is 9799966562.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2656699979 - 2⁸ = 2656699723 is a prime.

It is not a weakly prime, because it can be changed into another prime (2656699379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1328349989 + 1328349990.

It is an arithmetic number, because the mean of its divisors is an integer number (1328349990).

Almost surely, 2^2656699979 is an apocalyptic number.

2656699979 is a deficient number, since it is larger than the sum of its proper divisors (1).

2656699979 is an equidigital number, since it uses as much as digits as its factorization.

2656699979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 99202320, while the sum is 68.

The square root of 2656699979 is about 51543.1855728767. The cubic root of 2656699979 is about 1384.9927630635.

The spelling of 2656699979 in words is "two billion, six hundred fifty-six million, six hundred ninety-nine thousand, nine hundred seventy-nine".