18518505679 has 2 divisors, whose sum is σ = 18518505680. Its totient is φ = 18518505678.

The previous prime is 18518505631. The next prime is 18518505749. The reversal of 18518505679 is 97650581581.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18518505679 - 2²¹ = 18516408527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18518505479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9259252839 + 9259252840.

It is an arithmetic number, because the mean of its divisors is an integer number (9259252840).

Almost surely, 2^18518505679 is an apocalyptic number.

18518505679 is a deficient number, since it is larger than the sum of its proper divisors (1).

18518505679 is an equidigital number, since it uses as much as digits as its factorization.

18518505679 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024000, while the sum is 55.

The spelling of 18518505679 in words is "eighteen billion, five hundred eighteen million, five hundred five thousand, six hundred seventy-nine".