18806869507 has 4 divisors (see below), whose sum is σ = 18835670880. Its totient is φ = 18778068136.

The previous prime is 18806869397. The next prime is 18806869519. The reversal of 18806869507 is 70596860881.

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 18806869507 - 2¹⁹ = 18806345219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18806869597) 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, 14399707 + ... + 14401012.

It is an arithmetic number, because the mean of its divisors is an integer number (4708917720).

Almost surely, 2^18806869507 is an apocalyptic number.

18806869507 is a deficient number, since it is larger than the sum of its proper divisors (28801373).

18806869507 is an equidigital number, since it uses as much as digits as its factorization.

18806869507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28801372.

The product of its (nonzero) digits is 5806080, while the sum is 58.

The spelling of 18806869507 in words is "eighteen billion, eight hundred six million, eight hundred sixty-nine thousand, five hundred seven".