206666402 has 8 divisors (see below), whose sum is σ = 313069212. Its totient is φ = 102310000.

The previous prime is 206666359. The next prime is 206666413. The reversal of 206666402 is 204666602.

206666402 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 184660921 + 22005481 = 13589^2 + 4691^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×206666402² = 85422003431251208, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 511349 + ... + 511752.

Almost surely, 2^206666402 is an apocalyptic number.

206666402 is a deficient number, since it is larger than the sum of its proper divisors (106402810).

206666402 is a wasteful number, since it uses less digits than its factorization.

206666402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1023204.

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 206666402 is about 14375.8965633452. The cubic root of 206666402 is about 591.2302224804.

The spelling of 206666402 in words is "two hundred six million, six hundred sixty-six thousand, four hundred two".