206664659994 has 64 divisors (see below), whose sum is σ = 460574634240. Its totient is φ = 61382845440.

The previous prime is 206664659939. The next prime is 206664660119. The reversal of 206664659994 is 499956466602.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15535554 + ... + 15548850.

It is an arithmetic number, because the mean of its divisors is an integer number (7196478660).

Almost surely, 2^206664659994 is an apocalyptic number.

206664659994 is an abundant number, since it is smaller than the sum of its proper divisors (253909974246).

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

206664659994 is a wasteful number, since it uses less digits than its factorization.

206664659994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20215.

The product of its (nonzero) digits is 151165440, while the sum is 66.

The spelling of 206664659994 in words is "two hundred six billion, six hundred sixty-four million, six hundred fifty-nine thousand, nine hundred ninety-four".