18909918479 has 2 divisors, whose sum is σ = 18909918480. Its totient is φ = 18909918478.

The previous prime is 18909918421. The next prime is 18909918527. The reversal of 18909918479 is 97481990981.

It is a strong prime.

It is an emirp because it is prime and its reverse (97481990981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18909918479 - 2¹⁶ = 18909852943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18909918679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9454959239 + 9454959240.

It is an arithmetic number, because the mean of its divisors is an integer number (9454959240).

Almost surely, 2^18909918479 is an apocalyptic number.

18909918479 is a deficient number, since it is larger than the sum of its proper divisors (1).

18909918479 is an equidigital number, since it uses as much as digits as its factorization.

18909918479 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11757312, while the sum is 65.

The spelling of 18909918479 in words is "eighteen billion, nine hundred nine million, nine hundred eighteen thousand, four hundred seventy-nine".