18915279923 has 2 divisors, whose sum is σ = 18915279924. Its totient is φ = 18915279922.

The previous prime is 18915279881. The next prime is 18915279941. The reversal of 18915279923 is 32997251981.

It is a strong prime.

It is an emirp because it is prime and its reverse (32997251981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18915279923 - 2³² = 14620312627 is a prime.

It is a super-3 number, since 3×18915279923³ (a number of 32 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (18915279953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9457639961 + 9457639962.

It is an arithmetic number, because the mean of its divisors is an integer number (9457639962).

Almost surely, 2^18915279923 is an apocalyptic number.

18915279923 is a deficient number, since it is larger than the sum of its proper divisors (1).

18915279923 is an equidigital number, since it uses as much as digits as its factorization.

18915279923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2449440, while the sum is 56.

The spelling of 18915279923 in words is "eighteen billion, nine hundred fifteen million, two hundred seventy-nine thousand, nine hundred twenty-three".