18012666 has 16 divisors (see below), whose sum is σ = 41171904. Its totient is φ = 5146464.

The previous prime is 18012661. The next prime is 18012671. The reversal of 18012666 is 66621081.

It is an interprime number because it is at equal distance from previous prime (18012661) and next prime (18012671).

It is a super-2 number, since 2×18012666² = 648912272855112, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18012661) 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, 214395 + ... + 214478.

It is an arithmetic number, because the mean of its divisors is an integer number (2573244).

Almost surely, 2^18012666 is an apocalyptic number.

18012666 is an abundant number, since it is smaller than the sum of its proper divisors (23159238).

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

18012666 is a wasteful number, since it uses less digits than its factorization.

18012666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428885.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 18012666 is about 4244.1331270355. The cubic root of 18012666 is about 262.1355959535.

The spelling of 18012666 in words is "eighteen million, twelve thousand, six hundred sixty-six".