206404213446 has 40 divisors (see below), whose sum is σ = 462557846520. Its totient is φ = 68792550912.

The previous prime is 206404213427. The next prime is 206404213481. The reversal of 206404213446 is 644312404602.

206404213446 is a `hidden beast` number, since 2 + 0 + 640 + 4 + 2 + 1 + 3 + 4 + 4 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 206404213446.

It is a congruent number.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 1247110 + ... + 1402886.

It is an arithmetic number, because the mean of its divisors is an integer number (11563946163).

Almost surely, 2^206404213446 is an apocalyptic number.

206404213446 is an abundant number, since it is smaller than the sum of its proper divisors (256153633074).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

206404213446 is a wasteful number, since it uses less digits than its factorization.

206404213446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163970 (or 163961 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 36.

The spelling of 206404213446 in words is "two hundred six billion, four hundred four million, two hundred thirteen thousand, four hundred forty-six".