18999099979 has 2 divisors, whose sum is σ = 18999099980. Its totient is φ = 18999099978.

The previous prime is 18999099971. The next prime is 18999100013. The reversal of 18999099979 is 97999099981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18999099979 - 2³ = 18999099971 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18999099899 and 18999099908.

It is not a weakly prime, because it can be changed into another prime (18999099971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9499549989 + 9499549990.

It is an arithmetic number, because the mean of its divisors is an integer number (9499549990).

Almost surely, 2^18999099979 is an apocalyptic number.

18999099979 is a deficient number, since it is larger than the sum of its proper divisors (1).

18999099979 is an equidigital number, since it uses as much as digits as its factorization.

18999099979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 267846264, while the sum is 79.

The spelling of 18999099979 in words is "eighteen billion, nine hundred ninety-nine million, ninety-nine thousand, nine hundred seventy-nine".