16632661 has 4 divisors (see below), whose sum is σ = 16641612. Its totient is φ = 16623712.

The previous prime is 16632653. The next prime is 16632667. The reversal of 16632661 is 16623661.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 16623661 = 3299 ⋅5039.

It can be written as a sum of positive squares in 2 ways, for example, as 5616900 + 11015761 = 2370^2 + 3319^2 .

It is a cyclic number.

It is not a de Polignac number, because 16632661 - 2³ = 16632653 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16632667) 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, 526 + ... + 5791.

It is an arithmetic number, because the mean of its divisors is an integer number (4160403).

Almost surely, 2^16632661 is an apocalyptic number.

It is an amenable number.

16632661 is a deficient number, since it is larger than the sum of its proper divisors (8951).

16632661 is an equidigital number, since it uses as much as digits as its factorization.

16632661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8950.

The product of its digits is 7776, while the sum is 31.

The square root of 16632661 is about 4078.3159514682. The cubic root of 16632661 is about 255.2626334231.

The spelling of 16632661 in words is "sixteen million, six hundred thirty-two thousand, six hundred sixty-one".