18396536562749 has 2 divisors, whose sum is σ = 18396536562750. Its totient is φ = 18396536562748.

The previous prime is 18396536562743. The next prime is 18396536562763. The reversal of 18396536562749 is 94726563569381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9301981507225 + 9094555055524 = 3049915^2 + 3015718^2 .

It is a cyclic number.

It is not a de Polignac number, because 18396536562749 - 2³⁶ = 18327817086013 is a prime.

It is a super-2 number, since 2×18396536562749² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18396536562743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9198268281374 + 9198268281375.

It is an arithmetic number, because the mean of its divisors is an integer number (9198268281375).

Almost surely, 2^{18396536562749} is an apocalyptic number.

It is an amenable number.

18396536562749 is a deficient number, since it is larger than the sum of its proper divisors (1).

18396536562749 is an equidigital number, since it uses as much as digits as its factorization.

18396536562749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1763596800, while the sum is 74.

The spelling of 18396536562749 in words is "eighteen trillion, three hundred ninety-six billion, five hundred thirty-six million, five hundred sixty-two thousand, seven hundred forty-nine".