18644709325 has 12 divisors (see below), whose sum is σ = 25221207168. Its totient is φ = 13559788400.

The previous prime is 18644709271. The next prime is 18644709359. The reversal of 18644709325 is 52390744681.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-18644709325 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33899197 + ... + 33899746.

It is an arithmetic number, because the mean of its divisors is an integer number (2101767264).

It is a 2-persistent number, because it is pandigital, and so is 2⋅18644709325 = 37289418650, but 3⋅18644709325 = 55934127975 is not.

Almost surely, 2^18644709325 is an apocalyptic number.

It is an amenable number.

18644709325 is a deficient number, since it is larger than the sum of its proper divisors (6576497843).

18644709325 is a wasteful number, since it uses less digits than its factorization.

18644709325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67798964 (or 67798959 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 49.

The spelling of 18644709325 in words is "eighteen billion, six hundred forty-four million, seven hundred nine thousand, three hundred twenty-five".