6699549979 has 2 divisors, whose sum is σ = 6699549980. Its totient is φ = 6699549978.

The previous prime is 6699549953. The next prime is 6699550007. The reversal of 6699549979 is 9799459966.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6699549979 - 2⁷ = 6699549851 is a prime.

It is a super-2 number, since 2×6699549979² = 89767939842237800882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6699549079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3349774989 + 3349774990.

It is an arithmetic number, because the mean of its divisors is an integer number (3349774990).

Almost surely, 2^6699549979 is an apocalyptic number.

6699549979 is a deficient number, since it is larger than the sum of its proper divisors (1).

6699549979 is an equidigital number, since it uses as much as digits as its factorization.

6699549979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 297606960, while the sum is 73.

The square root of 6699549979 is about 81850.7787317873. The cubic root of 6699549979 is about 1885.1614220549.

The spelling of 6699549979 in words is "six billion, six hundred ninety-nine million, five hundred forty-nine thousand, nine hundred seventy-nine".