18668345 has 4 divisors (see below), whose sum is σ = 22402020. Its totient is φ = 14934672.

The previous prime is 18668339. The next prime is 18668357. The reversal of 18668345 is 54386681.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5067001 + 13601344 = 2251^2 + 3688^2 .

It is a cyclic number.

It is not a de Polignac number, because 18668345 - 2¹⁰ = 18667321 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1866830 + ... + 1866839.

It is an arithmetic number, because the mean of its divisors is an integer number (5600505).

Almost surely, 2^18668345 is an apocalyptic number.

It is an amenable number.

18668345 is a deficient number, since it is larger than the sum of its proper divisors (3733675).

18668345 is an equidigital number, since it uses as much as digits as its factorization.

18668345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3733674.

The product of its digits is 138240, while the sum is 41.

The square root of 18668345 is about 4320.6880239147. The cubic root of 18668345 is about 265.2784305076.

The spelling of 18668345 in words is "eighteen million, six hundred sixty-eight thousand, three hundred forty-five".