18166569304993 has 2 divisors, whose sum is σ = 18166569304994. Its totient is φ = 18166569304992.

The previous prime is 18166569304967. The next prime is 18166569305021. The reversal of 18166569304993 is 39940396566181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18116872857664 + 49696447329 = 4256392^2 + 222927^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18166569304993 is a prime.

It is a super-2 number, since 2×18166569304993² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18166569307993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9083284652496 + 9083284652497.

It is an arithmetic number, because the mean of its divisors is an integer number (9083284652497).

Almost surely, 2^{18166569304993} is an apocalyptic number.

It is an amenable number.

18166569304993 is a deficient number, since it is larger than the sum of its proper divisors (1).

18166569304993 is an equidigital number, since it uses as much as digits as its factorization.

18166569304993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 226748160, while the sum is 70.

The spelling of 18166569304993 in words is "eighteen trillion, one hundred sixty-six billion, five hundred sixty-nine million, three hundred four thousand, nine hundred ninety-three".