18648666 has 24 divisors (see below), whose sum is σ = 41498964. Its totient is φ = 6048000.

The previous prime is 18648659. The next prime is 18648673. The reversal of 18648666 is 66684681.

It is an interprime number because it is at equal distance from previous prime (18648659) and next prime (18648673).

It can be written as a sum of positive squares in 2 ways, for example, as 16769025 + 1879641 = 4095^2 + 1371^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13335 + ... + 14666.

Almost surely, 2^18648666 is an apocalyptic number.

18648666 is an abundant number, since it is smaller than the sum of its proper divisors (22850298).

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

18648666 is a wasteful number, since it uses less digits than its factorization.

18648666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28046 (or 28043 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The square root of 18648666 is about 4318.4101241082. The cubic root of 18648666 is about 265.1851844334.

The spelling of 18648666 in words is "eighteen million, six hundred forty-eight thousand, six hundred sixty-six".