16631645 has 16 divisors (see below), whose sum is σ = 21548160. Its totient is φ = 12285504.

The previous prime is 16631639. The next prime is 16631647. The reversal of 16631645 is 54613661.

It is a cyclic number.

It is not a de Polignac number, because 16631645 - 2⁶ = 16631581 is a prime.

It is a super-2 number, since 2×16631645² = 553223230812050, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16631647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 842 + ... + 5828.

It is an arithmetic number, because the mean of its divisors is an integer number (1346760).

Almost surely, 2^16631645 is an apocalyptic number.

It is an amenable number.

16631645 is a deficient number, since it is larger than the sum of its proper divisors (4916515).

16631645 is a wasteful number, since it uses less digits than its factorization.

16631645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5044.

The product of its digits is 12960, while the sum is 32.

The square root of 16631645 is about 4078.1913883485. The cubic root of 16631645 is about 255.2574357758.

The spelling of 16631645 in words is "sixteen million, six hundred thirty-one thousand, six hundred forty-five".