16668505 has 8 divisors (see below), whose sum is σ = 22859712. Its totient is φ = 11429808.

The previous prime is 16668499. The next prime is 16668511. The reversal of 16668505 is 50586661.

It is an interprime number because it is at equal distance from previous prime (16668499) and next prime (16668511).

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

It is a cyclic number.

It is not a de Polignac number, because 16668505 - 2³ = 16668497 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 238087 + ... + 238156.

It is an arithmetic number, because the mean of its divisors is an integer number (2857464).

Almost surely, 2^16668505 is an apocalyptic number.

It is an amenable number.

16668505 is a deficient number, since it is larger than the sum of its proper divisors (6191207).

16668505 is an equidigital number, since it uses as much as digits as its factorization.

16668505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476255.

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 16668505 is about 4082.7080473627. The cubic root of 16668505 is about 255.4458686671.

The spelling of 16668505 in words is "sixteen million, six hundred sixty-eight thousand, five hundred five".