18646345769 has 2 divisors, whose sum is σ = 18646345770. Its totient is φ = 18646345768.

The previous prime is 18646345703. The next prime is 18646345829. The reversal of 18646345769 is 96754364681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18336409744 + 309936025 = 135412^2 + 17605^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18646345769 is a prime.

It is a super-2 number, since 2×18646345769² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18646345469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9323172884 + 9323172885.

It is an arithmetic number, because the mean of its divisors is an integer number (9323172885).

Almost surely, 2^18646345769 is an apocalyptic number.

It is an amenable number.

18646345769 is a deficient number, since it is larger than the sum of its proper divisors (1).

18646345769 is an equidigital number, since it uses as much as digits as its factorization.

18646345769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26127360, while the sum is 59.

It can be divided in two parts, 186463 and 45769, that added together give a palindrome (232232).

The spelling of 18646345769 in words is "eighteen billion, six hundred forty-six million, three hundred forty-five thousand, seven hundred sixty-nine".