18516885479 has 2 divisors, whose sum is σ = 18516885480. Its totient is φ = 18516885478.

The previous prime is 18516885437. The next prime is 18516885509. The reversal of 18516885479 is 97458861581.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18516885479 - 2²⁰ = 18515836903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18516887479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9258442739 + 9258442740.

It is an arithmetic number, because the mean of its divisors is an integer number (9258442740).

Almost surely, 2^18516885479 is an apocalyptic number.

18516885479 is a deficient number, since it is larger than the sum of its proper divisors (1).

18516885479 is an equidigital number, since it uses as much as digits as its factorization.

18516885479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19353600, while the sum is 62.

The spelling of 18516885479 in words is "eighteen billion, five hundred sixteen million, eight hundred eighty-five thousand, four hundred seventy-nine".