18199563929 has 2 divisors, whose sum is σ = 18199563930. Its totient is φ = 18199563928.

The previous prime is 18199563919. The next prime is 18199564043. The reversal of 18199563929 is 92936599181.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16553395600 + 1646168329 = 128660^2 + 40573^2 .

It is an emirp because it is prime and its reverse (92936599181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18199563929 - 2²⁸ = 17931128473 is a prime.

It is not a weakly prime, because it can be changed into another prime (18199563919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9099781964 + 9099781965.

It is an arithmetic number, because the mean of its divisors is an integer number (9099781965).

Almost surely, 2^18199563929 is an apocalyptic number.

It is an amenable number.

18199563929 is a deficient number, since it is larger than the sum of its proper divisors (1).

18199563929 is an equidigital number, since it uses as much as digits as its factorization.

18199563929 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9447840, while the sum is 62.

The spelling of 18199563929 in words is "eighteen billion, one hundred ninety-nine million, five hundred sixty-three thousand, nine hundred twenty-nine".