18699415947 has 12 divisors (see below), whose sum is σ = 28010648120. Its totient is φ = 12466277136.

The previous prime is 18699415939. The next prime is 18699415961. The reversal of 18699415947 is 74951499681.

It is not a de Polignac number, because 18699415947 - 2³ = 18699415939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18699415907) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38475922 + ... + 38476407.

Almost surely, 2^18699415947 is an apocalyptic number.

18699415947 is a deficient number, since it is larger than the sum of its proper divisors (9311232173).

18699415947 is an frugal number, since it uses more digits than its factorization.

18699415947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76952344 (or 76952332 counting only the distinct ones).

The product of its digits is 19595520, while the sum is 63.

The spelling of 18699415947 in words is "eighteen billion, six hundred ninety-nine million, four hundred fifteen thousand, nine hundred forty-seven".