18744468307897 has 2 divisors, whose sum is σ = 18744468307898. Its totient is φ = 18744468307896.

The previous prime is 18744468307867. The next prime is 18744468307931. The reversal of 18744468307897 is 79870386444781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18292694784016 + 451773523881 = 4276996^2 + 672141^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18744468307897 is a prime.

It is not a weakly prime, because it can be changed into another prime (18744468307847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9372234153948 + 9372234153949.

It is an arithmetic number, because the mean of its divisors is an integer number (9372234153949).

Almost surely, 2^{18744468307897} is an apocalyptic number.

It is an amenable number.

18744468307897 is a deficient number, since it is larger than the sum of its proper divisors (1).

18744468307897 is an equidigital number, since it uses as much as digits as its factorization.

18744468307897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1820786688, while the sum is 76.

The spelling of 18744468307897 in words is "eighteen trillion, seven hundred forty-four billion, four hundred sixty-eight million, three hundred seven thousand, eight hundred ninety-seven".