18601139999 has 4 divisors (see below), whose sum is σ = 20031996936. Its totient is φ = 17170283064.

The previous prime is 18601139987. The next prime is 18601140091. The reversal of 18601139999 is 99993110681.

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

It is a cyclic number.

It is not a de Polignac number, because 18601139999 - 2²⁰ = 18600091423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18601139959) 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, 715428449 + ... + 715428474.

It is an arithmetic number, because the mean of its divisors is an integer number (5007999234).

Almost surely, 2^18601139999 is an apocalyptic number.

18601139999 is a deficient number, since it is larger than the sum of its proper divisors (1430856937).

18601139999 is a wasteful number, since it uses less digits than its factorization.

18601139999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1430856936.

The product of its (nonzero) digits is 944784, while the sum is 56.

The spelling of 18601139999 in words is "eighteen billion, six hundred one million, one hundred thirty-nine thousand, nine hundred ninety-nine".