18640329499 has 4 divisors (see below), whose sum is σ = 20334904920. Its totient is φ = 16945754080.

The previous prime is 18640329479. The next prime is 18640329517. The reversal of 18640329499 is 99492304681.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18640329499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18640329479) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 847287694 + ... + 847287715.

It is an arithmetic number, because the mean of its divisors is an integer number (5083726230).

Almost surely, 2^18640329499 is an apocalyptic number.

18640329499 is a deficient number, since it is larger than the sum of its proper divisors (1694575421).

18640329499 is a wasteful number, since it uses less digits than its factorization.

18640329499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1694575420.

The product of its (nonzero) digits is 3359232, while the sum is 55.

The spelling of 18640329499 in words is "eighteen billion, six hundred forty million, three hundred twenty-nine thousand, four hundred ninety-nine".