18245291969 has 2 divisors, whose sum is σ = 18245291970. Its totient is φ = 18245291968.

The previous prime is 18245291957. The next prime is 18245292001. The reversal of 18245291969 is 96919254281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13280257600 + 4965034369 = 115240^2 + 70463^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18245291969 is a prime.

It is a super-2 number, since 2×18245291969² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18245291069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9122645984 + 9122645985.

It is an arithmetic number, because the mean of its divisors is an integer number (9122645985).

Almost surely, 2^18245291969 is an apocalyptic number.

It is an amenable number.

18245291969 is a deficient number, since it is larger than the sum of its proper divisors (1).

18245291969 is an equidigital number, since it uses as much as digits as its factorization.

18245291969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2799360, while the sum is 56.

The spelling of 18245291969 in words is "eighteen billion, two hundred forty-five million, two hundred ninety-one thousand, nine hundred sixty-nine".