18899531634 has 16 divisors (see below), whose sum is σ = 37800410688. Its totient is φ = 6299619312.

The previous prime is 18899531621. The next prime is 18899531639. The reversal of 18899531634 is 43613599881.

It is not an unprimeable number, because it can be changed into a prime (18899531639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 299584 + ... + 357140.

It is an arithmetic number, because the mean of its divisors is an integer number (2362525668).

Almost surely, 2^18899531634 is an apocalyptic number.

18899531634 is an abundant number, since it is smaller than the sum of its proper divisors (18900879054).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18899531634 is a wasteful number, since it uses less digits than its factorization.

18899531634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112289.

The product of its digits is 5598720, while the sum is 57.

The spelling of 18899531634 in words is "eighteen billion, eight hundred ninety-nine million, five hundred thirty-one thousand, six hundred thirty-four".