16631664 has 40 divisors (see below), whose sum is σ = 49104000. Its totient is φ = 4751808.

The previous prime is 16631647. The next prime is 16631689. The reversal of 16631664 is 46613661.

It is a super-2 number, since 2×16631664² = 553224494817792, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a nialpdrome in base 16.

It is a congruent 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, 24414 + ... + 25085.

It is an arithmetic number, because the mean of its divisors is an integer number (1227600).

Almost surely, 2^16631664 is an apocalyptic number.

16631664 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

16631664 is an abundant number, since it is smaller than the sum of its proper divisors (32472336).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16631664 is a wasteful number, since it uses less digits than its factorization.

16631664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49517 (or 49511 counting only the distinct ones).

The product of its digits is 15552, while the sum is 33.

The square root of 16631664 is about 4078.1937178118. The cubic root of 16631664 is about 255.2575329778.

The spelling of 16631664 in words is "sixteen million, six hundred thirty-one thousand, six hundred sixty-four".