206681656 has 16 divisors (see below), whose sum is σ = 396980640. Its totient is φ = 100820160.

The previous prime is 206681647. The next prime is 206681663. The reversal of 206681656 is 656186602.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 314736 + ... + 315391.

It is an arithmetic number, because the mean of its divisors is an integer number (24811290).

Almost surely, 2^206681656 is an apocalyptic number.

It is an amenable number.

206681656 is a deficient number, since it is larger than the sum of its proper divisors (190298984).

206681656 is a wasteful number, since it uses less digits than its factorization.

206681656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630174 (or 630170 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 206681656 is about 14376.4270943792. The cubic root of 206681656 is about 591.2447683119.

It can be divided in two parts, 206681 and 656, that multiplied together give a square (135582736 = 11644²).

The spelling of 206681656 in words is "two hundred six million, six hundred eighty-one thousand, six hundred fifty-six".