208666323406 has 8 divisors (see below), whose sum is σ = 329473142280. Its totient is φ = 98841942648.

The previous prime is 208666323403. The next prime is 208666323409. The reversal of 208666323406 is 604323666802.

It is an interprime number because it is at equal distance from previous prime (208666323403) and next prime (208666323409).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208666323403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2745609481 + ... + 2745609556.

It is an arithmetic number, because the mean of its divisors is an integer number (41184142785).

Almost surely, 2^208666323406 is an apocalyptic number.

208666323406 is a deficient number, since it is larger than the sum of its proper divisors (120806818874).

208666323406 is a wasteful number, since it uses less digits than its factorization.

208666323406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5491219058.

The product of its (nonzero) digits is 1492992, while the sum is 46.

The spelling of 208666323406 in words is "two hundred eight billion, six hundred sixty-six million, three hundred twenty-three thousand, four hundred six".