16601645 has 8 divisors (see below), whose sum is σ = 20011104. Its totient is φ = 13221904.

The previous prime is 16601633. The next prime is 16601693. The reversal of 16601645 is 54610661.

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

It is a cyclic number.

It is not a de Polignac number, because 16601645 - 2¹² = 16597549 is a prime.

It is a super-3 number, since 3×16601645³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

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, 6179 + ... + 8448.

It is an arithmetic number, because the mean of its divisors is an integer number (2501388).

Almost surely, 2^16601645 is an apocalyptic number.

It is an amenable number.

16601645 is a deficient number, since it is larger than the sum of its proper divisors (3409459).

16601645 is a wasteful number, since it uses less digits than its factorization.

16601645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14859.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 16601645 is about 4074.5116271769. The cubic root of 16601645 is about 255.1038664405.

The spelling of 16601645 in words is "sixteen million, six hundred one thousand, six hundred forty-five".