16644007 has 4 divisors (see below), whose sum is σ = 16705696. Its totient is φ = 16582320.

The previous prime is 16643989. The next prime is 16644011. The reversal of 16644007 is 70044661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70044661 = 107 ⋅654623.

It is a cyclic number.

It is not a de Polignac number, because 16644007 - 2²³ = 8255399 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 (16644097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30438 + ... + 30979.

It is an arithmetic number, because the mean of its divisors is an integer number (4176424).

Almost surely, 2^16644007 is an apocalyptic number.

16644007 is a deficient number, since it is larger than the sum of its proper divisors (61689).

16644007 is an equidigital number, since it uses as much as digits as its factorization.

16644007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61688.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 16644007 is about 4079.7067296559. The cubic root of 16644007 is about 255.3206628536.

Adding to 16644007 its reverse (70044661), we get a palindrome (86688668).

It can be divided in two parts, 1664 and 4007, that added together give a triangular number (5671 = T₁₀₆).

The spelling of 16644007 in words is "sixteen million, six hundred forty-four thousand, seven".