18166945 has 8 divisors (see below), whose sum is σ = 22947840. Its totient is φ = 13768560.

The previous prime is 18166943. The next prime is 18166979. The reversal of 18166945 is 54966181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18166945 - 2¹ = 18166943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18166898 and 18166907.

It is not an unprimeable number, because it can be changed into a prime (18166943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95521 + ... + 95710.

It is an arithmetic number, because the mean of its divisors is an integer number (2868480).

Almost surely, 2^18166945 is an apocalyptic number.

It is an amenable number.

18166945 is a deficient number, since it is larger than the sum of its proper divisors (4780895).

18166945 is a wasteful number, since it uses less digits than its factorization.

18166945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191255.

The product of its digits is 51840, while the sum is 40.

The square root of 18166945 is about 4262.2699351402. The cubic root of 18166945 is about 262.8818690030.

It can be divided in two parts, 18166 and 945, that multiplied together give a triangular number (17166870 = T₅₈₅₉).

The spelling of 18166945 in words is "eighteen million, one hundred sixty-six thousand, nine hundred forty-five".