18915279679 has 2 divisors, whose sum is σ = 18915279680. Its totient is φ = 18915279678.

The previous prime is 18915279671. The next prime is 18915279701. The reversal of 18915279679 is 97697251981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18915279679 - 2³ = 18915279671 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18915279679.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18915279671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9457639839 + 9457639840.

It is an arithmetic number, because the mean of its divisors is an integer number (9457639840).

Almost surely, 2^18915279679 is an apocalyptic number.

18915279679 is a deficient number, since it is larger than the sum of its proper divisors (1).

18915279679 is an equidigital number, since it uses as much as digits as its factorization.

18915279679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17146080, while the sum is 64.

The spelling of 18915279679 in words is "eighteen billion, nine hundred fifteen million, two hundred seventy-nine thousand, six hundred seventy-nine".