18858389649 has 16 divisors (see below), whose sum is σ = 27449333184. Its totient is φ = 11421432000.

The previous prime is 18858389617. The next prime is 18858389707. The reversal of 18858389649 is 94698385881.

It is not a de Polignac number, because 18858389649 - 2⁵ = 18858389617 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18858387649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148702 + ... + 244599.

It is an arithmetic number, because the mean of its divisors is an integer number (1715583324).

Almost surely, 2^18858389649 is an apocalyptic number.

It is an amenable number.

18858389649 is a deficient number, since it is larger than the sum of its proper divisors (8590943535).

18858389649 is a wasteful number, since it uses less digits than its factorization.

18858389649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394768.

The product of its digits is 119439360, while the sum is 69.

The spelling of 18858389649 in words is "eighteen billion, eight hundred fifty-eight million, three hundred eighty-nine thousand, six hundred forty-nine".