16661607 has 8 divisors (see below), whose sum is σ = 22235760. Its totient is φ = 11097600.

The previous prime is 16661599. The next prime is 16661629. The reversal of 16661607 is 70616661.

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

It is not a de Polignac number, because 16661607 - 2³ = 16661599 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16661107) 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, 3069 + ... + 6537.

It is an arithmetic number, because the mean of its divisors is an integer number (2779470).

Almost surely, 2^16661607 is an apocalyptic number.

16661607 is a deficient number, since it is larger than the sum of its proper divisors (5574153).

16661607 is a wasteful number, since it uses less digits than its factorization.

16661607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5073.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 16661607 is about 4081.8631775208. The cubic root of 16661607 is about 255.4106263798.

The spelling of 16661607 in words is "sixteen million, six hundred sixty-one thousand, six hundred seven".