16630621 has 8 divisors (see below), whose sum is σ = 19411200. Its totient is φ = 13951248.

The previous prime is 16630619. The next prime is 16630631. The reversal of 16630621 is 12603661.

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 16630621 - 2¹ = 16630619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16630631) 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, 24946 + ... + 25603.

It is an arithmetic number, because the mean of its divisors is an integer number (2426400).

Almost surely, 2^16630621 is an apocalyptic number.

It is an amenable number.

16630621 is a deficient number, since it is larger than the sum of its proper divisors (2780579).

16630621 is an equidigital number, since it uses as much as digits as its factorization.

16630621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50603.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 16630621 is about 4078.0658405671. The cubic root of 16630621 is about 255.2521969879.

The spelling of 16630621 in words is "sixteen million, six hundred thirty thousand, six hundred twenty-one".