18336867235537 has 2 divisors, whose sum is σ = 18336867235538. Its totient is φ = 18336867235536.

The previous prime is 18336867235529. The next prime is 18336867235541. The reversal of 18336867235537 is 73553276863381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16566519899601 + 1770347335936 = 4070199^2 + 1330544^2 .

It is a cyclic number.

It is not a de Polignac number, because 18336867235537 - 2³ = 18336867235529 is a prime.

It is not a weakly prime, because it can be changed into another prime (18336867235597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9168433617768 + 9168433617769.

It is an arithmetic number, because the mean of its divisors is an integer number (9168433617769).

Almost surely, 2^{18336867235537} is an apocalyptic number.

It is an amenable number.

18336867235537 is a deficient number, since it is larger than the sum of its proper divisors (1).

18336867235537 is an equidigital number, since it uses as much as digits as its factorization.

18336867235537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 457228800, while the sum is 67.

The spelling of 18336867235537 in words is "eighteen trillion, three hundred thirty-six billion, eight hundred sixty-seven million, two hundred thirty-five thousand, five hundred thirty-seven".