206640667 has 2 divisors, whose sum is σ = 206640668. Its totient is φ = 206640666.

The previous prime is 206640617. The next prime is 206640683. The reversal of 206640667 is 766046602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 206640667 - 2²⁷ = 72422939 is a prime.

It is not a weakly prime, because it can be changed into another prime (206640607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103320333 + 103320334.

It is an arithmetic number, because the mean of its divisors is an integer number (103320334).

Almost surely, 2^206640667 is an apocalyptic number.

206640667 is a deficient number, since it is larger than the sum of its proper divisors (1).

206640667 is an equidigital number, since it uses as much as digits as its factorization.

206640667 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 37.

The square root of 206640667 is about 14375.0014608695. The cubic root of 206640667 is about 591.2056806081.

The spelling of 206640667 in words is "two hundred six million, six hundred forty thousand, six hundred sixty-seven".