18989383225 has 24 divisors (see below), whose sum is σ = 23922855000. Its totient is φ = 14950794240.

The previous prime is 18989383223. The next prime is 18989383229. The reversal of 18989383225 is 52238398981.

It can be written as a sum of positive squares in 12 ways, for example, as 9830127609 + 9159255616 = 99147^2 + 95704^2 .

It is not a de Polignac number, because 18989383225 - 2¹ = 18989383223 is a prime.

It is a super-2 number, since 2×18989383225² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18989383225.

It is not an unprimeable number, because it can be changed into a prime (18989383223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 382641 + ... + 429409.

It is an arithmetic number, because the mean of its divisors is an integer number (996785625).

Almost surely, 2^18989383225 is an apocalyptic number.

It is an amenable number.

18989383225 is a deficient number, since it is larger than the sum of its proper divisors (4933471775).

18989383225 is a wasteful number, since it uses less digits than its factorization.

18989383225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47037 (or 47032 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 58.

The spelling of 18989383225 in words is "eighteen billion, nine hundred eighty-nine million, three hundred eighty-three thousand, two hundred twenty-five".