18171617963 has 2 divisors, whose sum is σ = 18171617964. Its totient is φ = 18171617962.

The previous prime is 18171617941. The next prime is 18171618029. The reversal of 18171617963 is 36971617181.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18171617963 - 2³⁰ = 17097876139 is a prime.

It is not a weakly prime, because it can be changed into another prime (18171617903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9085808981 + 9085808982.

It is an arithmetic number, because the mean of its divisors is an integer number (9085808982).

Almost surely, 2^18171617963 is an apocalyptic number.

18171617963 is a deficient number, since it is larger than the sum of its proper divisors (1).

18171617963 is an equidigital number, since it uses as much as digits as its factorization.

18171617963 is an evil number, because the sum of its binary digits is even.

The product of its digits is 381024, while the sum is 50.

The spelling of 18171617963 in words is "eighteen billion, one hundred seventy-one million, six hundred seventeen thousand, nine hundred sixty-three".