16656587 has 4 divisors (see below), whose sum is σ = 16664760. Its totient is φ = 16648416.

The previous prime is 16656581. The next prime is 16656593. The reversal of 16656587 is 78565661.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (16656581) and next prime (16656593).

It is a cyclic number.

It is not a de Polignac number, because 16656587 - 2⁴ = 16656571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16656581) 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, 1748 + ... + 6030.

It is an arithmetic number, because the mean of its divisors is an integer number (4166190).

Almost surely, 2^16656587 is an apocalyptic number.

16656587 is a deficient number, since it is larger than the sum of its proper divisors (8173).

16656587 is an equidigital number, since it uses as much as digits as its factorization.

16656587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8172.

The product of its digits is 302400, while the sum is 44.

The square root of 16656587 is about 4081.2482159261. The cubic root of 16656587 is about 255.3849727892.

The spelling of 16656587 in words is "sixteen million, six hundred fifty-six thousand, five hundred eighty-seven".