18603666 has 12 divisors (see below), whose sum is σ = 40307982. Its totient is φ = 6201216.

The previous prime is 18603623. The next prime is 18603667. The reversal of 18603666 is 66630681.

It can be written as a sum of positive squares in only one way, i.e., 16573041 + 2030625 = 4071^2 + 1425^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18603666.

It is not an unprimeable number, because it can be changed into a prime (18603667) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 516751 + ... + 516786.

Almost surely, 2^18603666 is an apocalyptic number.

18603666 is an abundant number, since it is smaller than the sum of its proper divisors (21704316).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18603666 is a wasteful number, since it uses less digits than its factorization.

18603666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1033545 (or 1033542 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 18603666 is about 4313.1967263272. The cubic root of 18603666 is about 264.9717117069.

The spelling of 18603666 in words is "eighteen million, six hundred three thousand, six hundred sixty-six".