18978080879 has 2 divisors, whose sum is σ = 18978080880. Its totient is φ = 18978080878.

The previous prime is 18978080857. The next prime is 18978080881. The reversal of 18978080879 is 97808087981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18978080879 - 2¹² = 18978076783 is a prime.

Together with 18978080881, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18978080279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9489040439 + 9489040440.

It is an arithmetic number, because the mean of its divisors is an integer number (9489040440).

Almost surely, 2^18978080879 is an apocalyptic number.

18978080879 is a deficient number, since it is larger than the sum of its proper divisors (1).

18978080879 is an equidigital number, since it uses as much as digits as its factorization.

18978080879 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16257024, while the sum is 65.

The spelling of 18978080879 in words is "eighteen billion, nine hundred seventy-eight million, eighty thousand, eight hundred seventy-nine".