18366868333537 has 2 divisors, whose sum is σ = 18366868333538. Its totient is φ = 18366868333536.

The previous prime is 18366868333501. The next prime is 18366868333601. The reversal of 18366868333537 is 73533386866381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14613004708416 + 3753863625121 = 3822696^2 + 1937489^2 .

It is a cyclic number.

It is not a de Polignac number, because 18366868333537 - 2²⁷ = 18366734115809 is a prime.

It is not a weakly prime, because it can be changed into another prime (18366868333637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9183434166768 + 9183434166769.

It is an arithmetic number, because the mean of its divisors is an integer number (9183434166769).

Almost surely, 2^{18366868333537} is an apocalyptic number.

It is an amenable number.

18366868333537 is a deficient number, since it is larger than the sum of its proper divisors (1).

18366868333537 is an equidigital number, since it uses as much as digits as its factorization.

18366868333537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 940584960, while the sum is 70.

The spelling of 18366868333537 in words is "eighteen trillion, three hundred sixty-six billion, eight hundred sixty-eight million, three hundred thirty-three thousand, five hundred thirty-seven".