18536703617 has 2 divisors, whose sum is σ = 18536703618. Its totient is φ = 18536703616.

The previous prime is 18536703569. The next prime is 18536703637. The reversal of 18536703617 is 71630763581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16788125761 + 1748577856 = 129569^2 + 41816^2 .

It is a cyclic number.

It is not a de Polignac number, because 18536703617 - 2²⁴ = 18519926401 is a prime.

It is not a weakly prime, because it can be changed into another prime (18536703637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9268351808 + 9268351809.

It is an arithmetic number, because the mean of its divisors is an integer number (9268351809).

Almost surely, 2^18536703617 is an apocalyptic number.

It is an amenable number.

18536703617 is a deficient number, since it is larger than the sum of its proper divisors (1).

18536703617 is an equidigital number, since it uses as much as digits as its factorization.

18536703617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 635040, while the sum is 47.

The spelling of 18536703617 in words is "eighteen billion, five hundred thirty-six million, seven hundred three thousand, six hundred seventeen".