16661087 has 2 divisors, whose sum is σ = 16661088. Its totient is φ = 16661086.

The previous prime is 16661083. The next prime is 16661101. The reversal of 16661087 is 78016661.

It is a weak prime.

It is an emirp because it is prime and its reverse (78016661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16661087 - 2² = 16661083 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16661083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8330543 + 8330544.

It is an arithmetic number, because the mean of its divisors is an integer number (8330544).

Almost surely, 2^16661087 is an apocalyptic number.

16661087 is a deficient number, since it is larger than the sum of its proper divisors (1).

16661087 is an equidigital number, since it uses as much as digits as its factorization.

16661087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 16661087 is about 4081.7994806213. The cubic root of 16661087 is about 255.4079692750.

The spelling of 16661087 in words is "sixteen million, six hundred sixty-one thousand, eighty-seven".