206666872 has 8 divisors (see below), whose sum is σ = 387500400. Its totient is φ = 103333432.

The previous prime is 206666861. The next prime is 206666881. The reversal of 206666872 is 278666602.

206666872 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×206666872² = 85422391964528768, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12916672 + ... + 12916687.

It is an arithmetic number, because the mean of its divisors is an integer number (48437550).

Almost surely, 2^206666872 is an apocalyptic number.

It is an amenable number.

206666872 is a deficient number, since it is larger than the sum of its proper divisors (180833528).

206666872 is a wasteful number, since it uses less digits than its factorization.

206666872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25833365 (or 25833361 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 43.

The square root of 206666872 is about 14375.9129101424. The cubic root of 206666872 is about 591.2306706713.

The spelling of 206666872 in words is "two hundred six million, six hundred sixty-six thousand, eight hundred seventy-two".