18397690979 has 2 divisors, whose sum is σ = 18397690980. Its totient is φ = 18397690978.

The previous prime is 18397690957. The next prime is 18397690999. The reversal of 18397690979 is 97909679381.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18397690979 - 2⁸ = 18397690723 is a prime.

It is not a weakly prime, because it can be changed into another prime (18397690919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9198845489 + 9198845490.

It is an arithmetic number, because the mean of its divisors is an integer number (9198845490).

Almost surely, 2^18397690979 is an apocalyptic number.

18397690979 is a deficient number, since it is larger than the sum of its proper divisors (1).

18397690979 is an equidigital number, since it uses as much as digits as its factorization.

18397690979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46294416, while the sum is 68.

The spelling of 18397690979 in words is "eighteen billion, three hundred ninety-seven million, six hundred ninety thousand, nine hundred seventy-nine".