206666463 has 4 divisors (see below), whose sum is σ = 275555288. Its totient is φ = 137777640.

The previous prime is 206666461. The next prime is 206666483. The reversal of 206666463 is 364666602.

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

It is not a de Polignac number, because 206666463 - 2¹ = 206666461 is a prime.

It is a super-2 number, since 2×206666463² = 85422053857860738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206666461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34444408 + ... + 34444413.

It is an arithmetic number, because the mean of its divisors is an integer number (68888822).

Almost surely, 2^206666463 is an apocalyptic number.

206666463 is a deficient number, since it is larger than the sum of its proper divisors (68888825).

206666463 is an equidigital number, since it uses as much as digits as its factorization.

206666463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68888824.

The product of its (nonzero) digits is 186624, while the sum is 39.

The square root of 206666463 is about 14375.8986849518. The cubic root of 206666463 is about 591.2302806499.

The spelling of 206666463 in words is "two hundred six million, six hundred sixty-six thousand, four hundred sixty-three".