18345885697 has 2 divisors, whose sum is σ = 18345885698. Its totient is φ = 18345885696.

The previous prime is 18345885673. The next prime is 18345885709. The reversal of 18345885697 is 79658854381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13771257201 + 4574628496 = 117351^2 + 67636^2 .

It is a cyclic number.

It is not a de Polignac number, because 18345885697 - 2¹¹ = 18345883649 is a prime.

It is not a weakly prime, because it can be changed into another prime (18345885637) by changing a digit.

It is a Pierpont prime, being equal to 2²³ ⋅ 3⁷ + 1.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9172942848 + 9172942849.

It is an arithmetic number, because the mean of its divisors is an integer number (9172942849).

It is a Proth number, since it is equal to 2187 ⋅ 2²³ + 1 and 2187 < 2²³.

Almost surely, 2^18345885697 is an apocalyptic number.

It is an amenable number.

18345885697 is a deficient number, since it is larger than the sum of its proper divisors (1).

18345885697 is an equidigital number, since it uses as much as digits as its factorization.

18345885697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58060800, while the sum is 64.

The spelling of 18345885697 in words is "eighteen billion, three hundred forty-five million, eight hundred eighty-five thousand, six hundred ninety-seven".