18659987247 has 16 divisors (see below), whose sum is σ = 27177131520. Its totient is φ = 11294361600.

The previous prime is 18659987237. The next prime is 18659987251. The reversal of 18659987247 is 74278995681.

It is not a de Polignac number, because 18659987247 - 2⁶ = 18659987183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18659987207) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 342279 + ... + 393032.

It is an arithmetic number, because the mean of its divisors is an integer number (1698570720).

Almost surely, 2^18659987247 is an apocalyptic number.

18659987247 is a deficient number, since it is larger than the sum of its proper divisors (8517144273).

18659987247 is a wasteful number, since it uses less digits than its factorization.

18659987247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 736094.

The product of its digits is 60963840, while the sum is 66.

The spelling of 18659987247 in words is "eighteen billion, six hundred fifty-nine million, nine hundred eighty-seven thousand, two hundred forty-seven".