18645171377659 has 2 divisors, whose sum is σ = 18645171377660. Its totient is φ = 18645171377658.

The previous prime is 18645171377647. The next prime is 18645171377687. The reversal of 18645171377659 is 95677317154681.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18645171377659 - 2²⁹ = 18644634506747 is a prime.

It is not a weakly prime, because it can be changed into another prime (18645171377159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9322585688829 + 9322585688830.

It is an arithmetic number, because the mean of its divisors is an integer number (9322585688830).

Almost surely, 2^{18645171377659} is an apocalyptic number.

18645171377659 is a deficient number, since it is larger than the sum of its proper divisors (1).

18645171377659 is an equidigital number, since it uses as much as digits as its factorization.

18645171377659 is an evil number, because the sum of its binary digits is even.

The product of its digits is 266716800, while the sum is 70.

The spelling of 18645171377659 in words is "eighteen trillion, six hundred forty-five billion, one hundred seventy-one million, three hundred seventy-seven thousand, six hundred fifty-nine".