206645623138 has 32 divisors (see below), whose sum is σ = 320572676160. Its totient is φ = 99845269440.

The previous prime is 206645623123. The next prime is 206645623141. The reversal of 206645623138 is 831326546602.

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 15 ways as a sum of consecutive naturals, for example, 2998548 + ... + 3066688.

It is an arithmetic number, because the mean of its divisors is an integer number (10017896130).

Almost surely, 2^206645623138 is an apocalyptic number.

206645623138 is a deficient number, since it is larger than the sum of its proper divisors (113927053022).

206645623138 is a wasteful number, since it uses less digits than its factorization.

206645623138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68562.

The product of its (nonzero) digits is 1244160, while the sum is 46.

The spelling of 206645623138 in words is "two hundred six billion, six hundred forty-five million, six hundred twenty-three thousand, one hundred thirty-eight".