18186668445 has 48 divisors (see below), whose sum is σ = 33375194496. Its totient is φ = 8434377600.

The previous prime is 18186668431. The next prime is 18186668449. The reversal of 18186668445 is 54486668181.

It is not a de Polignac number, because 18186668445 - 2¹⁴ = 18186652061 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18186668449) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 176086 + ... + 259575.

It is an arithmetic number, because the mean of its divisors is an integer number (695316552).

Almost surely, 2^18186668445 is an apocalyptic number.

18186668445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18186668445 is a deficient number, since it is larger than the sum of its proper divisors (15188526051).

18186668445 is a wasteful number, since it uses less digits than its factorization.

18186668445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435714 (or 435703 counting only the distinct ones).

The product of its digits is 8847360, while the sum is 57.

The spelling of 18186668445 in words is "eighteen billion, one hundred eighty-six million, six hundred sixty-eight thousand, four hundred forty-five".