16641645 has 16 divisors (see below), whose sum is σ = 27246912. Its totient is φ = 8668800.

The previous prime is 16641617. The next prime is 16641649. The reversal of 16641645 is 54614661.

It is a happy number.

It is not a de Polignac number, because 16641645 - 2⁷ = 16641517 is a prime.

It is a super-3 number, since 3×16641645³ (a number of 23 digits) contains 333 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 (16641649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12256 + ... + 13545.

It is an arithmetic number, because the mean of its divisors is an integer number (1702932).

Almost surely, 2^16641645 is an apocalyptic number.

16641645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16641645 is a deficient number, since it is larger than the sum of its proper divisors (10605267).

16641645 is a wasteful number, since it uses less digits than its factorization.

16641645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25852.

The product of its digits is 17280, while the sum is 33.

The square root of 16641645 is about 4079.4172377927. The cubic root of 16641645 is about 255.3085845134.

The spelling of 16641645 in words is "sixteen million, six hundred forty-one thousand, six hundred forty-five".