16668791 has 2 divisors, whose sum is σ = 16668792. Its totient is φ = 16668790.

The previous prime is 16668749. The next prime is 16668797. The reversal of 16668791 is 19786661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16668791 - 2⁶ = 16668727 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 (16668797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8334395 + 8334396.

It is an arithmetic number, because the mean of its divisors is an integer number (8334396).

Almost surely, 2^16668791 is an apocalyptic number.

16668791 is a deficient number, since it is larger than the sum of its proper divisors (1).

16668791 is an equidigital number, since it uses as much as digits as its factorization.

16668791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 44.

The square root of 16668791 is about 4082.7430729841. The cubic root of 16668791 is about 255.4473296479.

The spelling of 16668791 in words is "sixteen million, six hundred sixty-eight thousand, seven hundred ninety-one".