16660291 has 2 divisors, whose sum is σ = 16660292. Its totient is φ = 16660290.

The previous prime is 16660277. The next prime is 16660313. The reversal of 16660291 is 19206661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16660291 - 2¹³ = 16652099 is a prime.

It is not a weakly prime, because it can be changed into another prime (16660271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8330145 + 8330146.

It is an arithmetic number, because the mean of its divisors is an integer number (8330146).

Almost surely, 2^16660291 is an apocalyptic number.

16660291 is a deficient number, since it is larger than the sum of its proper divisors (1).

16660291 is an equidigital number, since it uses as much as digits as its factorization.

16660291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 16660291 is about 4081.7019734420. The cubic root of 16660291 is about 255.4039017536.

The spelling of 16660291 in words is "sixteen million, six hundred sixty thousand, two hundred ninety-one".