18379636813 has 2 divisors, whose sum is σ = 18379636814. Its totient is φ = 18379636812.

The previous prime is 18379636729. The next prime is 18379636823. The reversal of 18379636813 is 31863697381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16414221924 + 1965414889 = 128118^2 + 44333^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18379636813 is a prime.

It is a super-2 number, since 2×18379636813² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18379636823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9189818406 + 9189818407.

It is an arithmetic number, because the mean of its divisors is an integer number (9189818407).

Almost surely, 2^18379636813 is an apocalyptic number.

It is an amenable number.

18379636813 is a deficient number, since it is larger than the sum of its proper divisors (1).

18379636813 is an equidigital number, since it uses as much as digits as its factorization.

18379636813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3919104, while the sum is 55.

The spelling of 18379636813 in words is "eighteen billion, three hundred seventy-nine million, six hundred thirty-six thousand, eight hundred thirteen".