6999979899 has 16 divisors (see below), whose sum is σ = 10184705280. Its totient is φ = 4241196960.

The previous prime is 6999979853. The next prime is 6999979913. The reversal of 6999979899 is 9989799996.

It is a happy number.

It is not a de Polignac number, because 6999979899 - 2⁷ = 6999979771 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6999979499) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94209 + ... + 151245.

It is an arithmetic number, because the mean of its divisors is an integer number (636544080).

Almost surely, 2^6999979899 is an apocalyptic number.

6999979899 is a deficient number, since it is larger than the sum of its proper divisors (3184725381).

6999979899 is a wasteful number, since it uses less digits than its factorization.

6999979899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60770.

The product of its digits is 1607077584, while the sum is 84.

The square root of 6999979899 is about 83665.8825268699. The cubic root of 6999979899 is about 1912.9293517311.

The spelling of 6999979899 in words is "six billion, nine hundred ninety-nine million, nine hundred seventy-nine thousand, eight hundred ninety-nine".