18545375882749 has 2 divisors, whose sum is σ = 18545375882750. Its totient is φ = 18545375882748.

The previous prime is 18545375882741. The next prime is 18545375882773. The reversal of 18545375882749 is 94728857354581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18534101265625 + 11274617124 = 4305125^2 + 106182^2 .

It is a cyclic number.

It is not a de Polignac number, because 18545375882749 - 2³ = 18545375882741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18545375882741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9272687941374 + 9272687941375.

It is an arithmetic number, because the mean of its divisors is an integer number (9272687941375).

Almost surely, 2^{18545375882749} is an apocalyptic number.

It is an amenable number.

18545375882749 is a deficient number, since it is larger than the sum of its proper divisors (1).

18545375882749 is an equidigital number, since it uses as much as digits as its factorization.

18545375882749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2709504000, while the sum is 76.

The spelling of 18545375882749 in words is "eighteen trillion, five hundred forty-five billion, three hundred seventy-five million, eight hundred eighty-two thousand, seven hundred forty-nine".