18631609689 has 64 divisors (see below), whose sum is σ = 31212288000. Its totient is φ = 9604016640.

The previous prime is 18631609679. The next prime is 18631609693. The reversal of 18631609689 is 98690613681.

It is a happy number.

It is not a de Polignac number, because 18631609689 - 2⁴ = 18631609673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18631609679) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 30099222 + ... + 30099840.

It is an arithmetic number, because the mean of its divisors is an integer number (487692000).

Almost surely, 2^18631609689 is an apocalyptic number.

It is an amenable number.

18631609689 is a deficient number, since it is larger than the sum of its proper divisors (12580678311).

18631609689 is a wasteful number, since it uses less digits than its factorization.

18631609689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1438.

The product of its (nonzero) digits is 3359232, while the sum is 57.

The spelling of 18631609689 in words is "eighteen billion, six hundred thirty-one million, six hundred nine thousand, six hundred eighty-nine".