206626245051666 has 64 divisors (see below), whose sum is σ = 452946026165760. Its totient is φ = 62319026520960.

The previous prime is 206626245051613. The next prime is 206626245051683. The reversal of 206626245051666 is 666150542626602.

It is a super-2 number, since 2×206626245051666² (a number of 29 digits) contains 22 as substring.

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, 46679145 + ... + 50913603.

It is an arithmetic number, because the mean of its divisors is an integer number (7077281658840).

Almost surely, 2^{206626245051666} is an apocalyptic number.

206626245051666 is an abundant number, since it is smaller than the sum of its proper divisors (246319781114094).

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

206626245051666 is a wasteful number, since it uses less digits than its factorization.

206626245051666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4237959.

The product of its (nonzero) digits is 37324800, while the sum is 57.

The spelling of 206626245051666 in words is "two hundred six trillion, six hundred twenty-six billion, two hundred forty-five million, fifty-one thousand, six hundred sixty-six".