18365672729 has 2 divisors, whose sum is σ = 18365672730. Its totient is φ = 18365672728.

The previous prime is 18365672723. The next prime is 18365672789. The reversal of 18365672729 is 92727656381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18340472329 + 25200400 = 135427^2 + 5020^2 .

It is an emirp because it is prime and its reverse (92727656381) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18365672729 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (18365672723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9182836364 + 9182836365.

It is an arithmetic number, because the mean of its divisors is an integer number (9182836365).

Almost surely, 2^18365672729 is an apocalyptic number.

It is an amenable number.

18365672729 is a deficient number, since it is larger than the sum of its proper divisors (1).

18365672729 is an equidigital number, since it uses as much as digits as its factorization.

18365672729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7620480, while the sum is 56.

The spelling of 18365672729 in words is "eighteen billion, three hundred sixty-five million, six hundred seventy-two thousand, seven hundred twenty-nine".