9901699979 has 2 divisors, whose sum is σ = 9901699980. Its totient is φ = 9901699978.

The previous prime is 9901699967. The next prime is 9901700009. The reversal of 9901699979 is 9799961099.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9901699979 - 2²⁴ = 9884922763 is a prime.

It is not a weakly prime, because it can be changed into another prime (9901699909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4950849989 + 4950849990.

It is an arithmetic number, because the mean of its divisors is an integer number (4950849990).

Almost surely, 2^9901699979 is an apocalyptic number.

9901699979 is a deficient number, since it is larger than the sum of its proper divisors (1).

9901699979 is an equidigital number, since it uses as much as digits as its factorization.

9901699979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22320522, while the sum is 68.

The square root of 9901699979 is about 99507.2860598660. The cubic root of 9901699979 is about 2147.3520658399.

The spelling of 9901699979 in words is "nine billion, nine hundred one million, six hundred ninety-nine thousand, nine hundred seventy-nine".