16660387 has 4 divisors (see below), whose sum is σ = 16673040. Its totient is φ = 16647736.

The previous prime is 16660351. The next prime is 16660403. The reversal of 16660387 is 78306661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78306661 = 857 ⋅91373.

It is a cyclic number.

It is not a de Polignac number, because 16660387 - 2¹¹ = 16658339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16660327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4087 + ... + 7072.

It is an arithmetic number, because the mean of its divisors is an integer number (4168260).

Almost surely, 2^16660387 is an apocalyptic number.

16660387 is a deficient number, since it is larger than the sum of its proper divisors (12653).

16660387 is a wasteful number, since it uses less digits than its factorization.

16660387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12652.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 16660387 is about 4081.7137332253. The cubic root of 16660387 is about 255.4043923158.

The spelling of 16660387 in words is "sixteen million, six hundred sixty thousand, three hundred eighty-seven".