16668247 has 2 divisors, whose sum is σ = 16668248. Its totient is φ = 16668246.

The previous prime is 16668233. The next prime is 16668257. The reversal of 16668247 is 74286661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16668247 - 2²³ = 8279639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16668257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8334123 + 8334124.

It is an arithmetic number, because the mean of its divisors is an integer number (8334124).

Almost surely, 2^16668247 is an apocalyptic number.

16668247 is a deficient number, since it is larger than the sum of its proper divisors (1).

16668247 is an equidigital number, since it uses as much as digits as its factorization.

16668247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 40.

The square root of 16668247 is about 4082.6764505652. The cubic root of 16668247 is about 255.4445507050. Note that the first 3 decimals are identical.

The spelling of 16668247 in words is "sixteen million, six hundred sixty-eight thousand, two hundred forty-seven".