18943607304613 has 2 divisors, whose sum is σ = 18943607304614. Its totient is φ = 18943607304612.

The previous prime is 18943607304529. The next prime is 18943607304617. The reversal of 18943607304613 is 31640370634981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11295937849249 + 7647669455364 = 3360943^2 + 2765442^2 .

It is a cyclic number.

It is not a de Polignac number, because 18943607304613 - 2⁹ = 18943607304101 is a prime.

It is a super-2 number, since 2×18943607304613² (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 (18943607304617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9471803652306 + 9471803652307.

It is an arithmetic number, because the mean of its divisors is an integer number (9471803652307).

Almost surely, 2^{18943607304613} is an apocalyptic number.

It is an amenable number.

18943607304613 is a deficient number, since it is larger than the sum of its proper divisors (1).

18943607304613 is an equidigital number, since it uses as much as digits as its factorization.

18943607304613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7838208, while the sum is 55.

The spelling of 18943607304613 in words is "eighteen trillion, nine hundred forty-three billion, six hundred seven million, three hundred four thousand, six hundred thirteen".