18379636729 has 2 divisors, whose sum is σ = 18379636730. Its totient is φ = 18379636728.

The previous prime is 18379636721. The next prime is 18379636813. The reversal of 18379636729 is 92763697381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12023561104 + 6356075625 = 109652^2 + 79725^2 .

It is a cyclic number.

It is not a de Polignac number, because 18379636729 - 2³ = 18379636721 is a prime.

It is a super-2 number, since 2×18379636729² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18379636721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9189818364 + 9189818365.

It is an arithmetic number, because the mean of its divisors is an integer number (9189818365).

Almost surely, 2^18379636729 is an apocalyptic number.

It is an amenable number.

18379636729 is a deficient number, since it is larger than the sum of its proper divisors (1).

18379636729 is an equidigital number, since it uses as much as digits as its factorization.

18379636729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20575296, while the sum is 61.

The spelling of 18379636729 in words is "eighteen billion, three hundred seventy-nine million, six hundred thirty-six thousand, seven hundred twenty-nine".