16660687 has 2 divisors, whose sum is σ = 16660688. Its totient is φ = 16660686.

The previous prime is 16660681. The next prime is 16660723. The reversal of 16660687 is 78606661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16660687 - 2¹¹ = 16658639 is a prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16660681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8330343 + 8330344.

It is an arithmetic number, because the mean of its divisors is an integer number (8330344).

Almost surely, 2^16660687 is an apocalyptic number.

16660687 is a deficient number, since it is larger than the sum of its proper divisors (1).

16660687 is an equidigital number, since it uses as much as digits as its factorization.

16660687 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 16660687 is about 4081.7504823299. The cubic root of 16660687 is about 255.4059253106.

The spelling of 16660687 in words is "sixteen million, six hundred sixty thousand, six hundred eighty-seven".