18634686386 has 8 divisors (see below), whose sum is σ = 28633786524. Its totient is φ = 9090090880.

The previous prime is 18634686379. The next prime is 18634686403. The reversal of 18634686386 is 68368643681.

It can be written as a sum of positive squares in 2 ways, for example, as 18501168361 + 133518025 = 136019^2 + 11555^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113626055 + ... + 113626218.

Almost surely, 2^18634686386 is an apocalyptic number.

18634686386 is a deficient number, since it is larger than the sum of its proper divisors (9999100138).

18634686386 is a wasteful number, since it uses less digits than its factorization.

18634686386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227252316.

The product of its digits is 23887872, while the sum is 59.

The spelling of 18634686386 in words is "eighteen billion, six hundred thirty-four million, six hundred eighty-six thousand, three hundred eighty-six".