206997667 has 2 divisors, whose sum is σ = 206997668. Its totient is φ = 206997666.

The previous prime is 206997641. The next prime is 206997671. The reversal of 206997667 is 766799602.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206997667 is a prime.

It is not a weakly prime, because it can be changed into another prime (206997607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103498833 + 103498834.

It is an arithmetic number, because the mean of its divisors is an integer number (103498834).

Almost surely, 2^206997667 is an apocalyptic number.

206997667 is a deficient number, since it is larger than the sum of its proper divisors (1).

206997667 is an equidigital number, since it uses as much as digits as its factorization.

206997667 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1714608, while the sum is 52.

The square root of 206997667 is about 14387.4134923550. The cubic root of 206997667 is about 591.5459476076.

The spelling of 206997667 in words is "two hundred six million, nine hundred ninety-seven thousand, six hundred sixty-seven".