16630661 has 4 divisors (see below), whose sum is σ = 16665024. Its totient is φ = 16596300.

The previous prime is 16630657. The next prime is 16630693. The reversal of 16630661 is 16603661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16630661 - 2² = 16630657 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 3 ways as a sum of consecutive naturals, for example, 16445 + ... + 17426.

It is an arithmetic number, because the mean of its divisors is an integer number (4166256).

Almost surely, 2^16630661 is an apocalyptic number.

It is an amenable number.

16630661 is a deficient number, since it is larger than the sum of its proper divisors (34363).

16630661 is an equidigital number, since it uses as much as digits as its factorization.

16630661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34362.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 16630661 is about 4078.0707448498. The cubic root of 16630661 is about 255.2524016321.

Subtracting from 16630661 its reverse (16603661), we obtain a cube (27000 = 30³).

The spelling of 16630661 in words is "sixteen million, six hundred thirty thousand, six hundred sixty-one".