16662418 has 4 divisors (see below), whose sum is σ = 24993630. Its totient is φ = 8331208.

The previous prime is 16662409. The next prime is 16662427. The reversal of 16662418 is 81426661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81426661 = 4597 ⋅17713.

It is an interprime number because it is at equal distance from previous prime (16662409) and next prime (16662427).

It can be written as a sum of positive squares in only one way, i.e., 16507969 + 154449 = 4063^2 + 393^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4165603 + ... + 4165606.

Almost surely, 2^16662418 is an apocalyptic number.

16662418 is a deficient number, since it is larger than the sum of its proper divisors (8331212).

16662418 is an equidigital number, since it uses as much as digits as its factorization.

16662418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8331211.

The product of its digits is 13824, while the sum is 34.

The square root of 16662418 is about 4081.9625182013. The cubic root of 16662418 is about 255.4147703309.

The spelling of 16662418 in words is "sixteen million, six hundred sixty-two thousand, four hundred eighteen".