206656326121564 has 24 divisors (see below), whose sum is σ = 394530540663168. Its totient is φ = 93933544368240.

The previous prime is 206656326121561. The next prime is 206656326121577. The reversal of 206656326121564 is 465121623656602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206656326121561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25090894 + ... + 32293429.

It is an arithmetic number, because the mean of its divisors is an integer number (16438772527632).

Almost surely, 2^{206656326121564} is an apocalyptic number.

It is an amenable number.

206656326121564 is a deficient number, since it is larger than the sum of its proper divisors (187874214541604).

206656326121564 is a wasteful number, since it uses less digits than its factorization.

206656326121564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57466185 (or 57466183 counting only the distinct ones).

The product of its (nonzero) digits is 18662400, while the sum is 55.

The spelling of 206656326121564 in words is "two hundred six trillion, six hundred fifty-six billion, three hundred twenty-six million, one hundred twenty-one thousand, five hundred sixty-four".