206434666 has 4 divisors (see below), whose sum is σ = 309652002. Its totient is φ = 103217332.

The previous prime is 206434651. The next prime is 206434681. The reversal of 206434666 is 666434602.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (206434651) and next prime (206434681).

It can be written as a sum of positive squares in only one way, i.e., 168870025 + 37564641 = 12995^2 + 6129^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51608665 + ... + 51608668.

Almost surely, 2^206434666 is an apocalyptic number.

206434666 is a deficient number, since it is larger than the sum of its proper divisors (103217336).

206434666 is a wasteful number, since it uses less digits than its factorization.

206434666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103217335.

The product of its (nonzero) digits is 124416, while the sum is 37.

The square root of 206434666 is about 14367.8344227653. The cubic root of 206434666 is about 591.0091567643.

The spelling of 206434666 in words is "two hundred six million, four hundred thirty-four thousand, six hundred sixty-six".