16668350291 has 2 divisors, whose sum is σ = 16668350292. Its totient is φ = 16668350290.

The previous prime is 16668350269. The next prime is 16668350299. The reversal of 16668350291 is 19205386661.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16668350291 is a prime.

It is not a weakly prime, because it can be changed into another prime (16668350299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8334175145 + 8334175146.

It is an arithmetic number, because the mean of its divisors is an integer number (8334175146).

Almost surely, 2^16668350291 is an apocalyptic number.

16668350291 is a deficient number, since it is larger than the sum of its proper divisors (1).

16668350291 is an equidigital number, since it uses as much as digits as its factorization.

16668350291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 466560, while the sum is 47.

The spelling of 16668350291 in words is "sixteen billion, six hundred sixty-eight million, three hundred fifty thousand, two hundred ninety-one".