16646631 has 8 divisors (see below), whose sum is σ = 22260864. Its totient is φ = 11065080.

The previous prime is 16646573. The next prime is 16646639. The reversal of 16646631 is 13664661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16646631 - 2¹⁷ = 16515559 is a prime.

It is a super-2 number, since 2×16646631² = 554220647300322, which contains 22 as substring.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 16646592 and 16646601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16646639) 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, 6955 + ... + 9036.

It is an arithmetic number, because the mean of its divisors is an integer number (2782608).

Almost surely, 2^16646631 is an apocalyptic number.

16646631 is a deficient number, since it is larger than the sum of its proper divisors (5614233).

16646631 is a wasteful number, since it uses less digits than its factorization.

16646631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16341.

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

The square root of 16646631 is about 4080.0283087253. The cubic root of 16646631 is about 255.3340796190.

The spelling of 16646631 in words is "sixteen million, six hundred forty-six thousand, six hundred thirty-one".