206645745 has 32 divisors (see below), whose sum is σ = 339571584. Its totient is φ = 107251200.

The previous prime is 206645743. The next prime is 206645753. The reversal of 206645745 is 547546602.

It is not a de Polignac number, because 206645745 - 2¹ = 206645743 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (206645741) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 271165 + ... + 271925.

It is an arithmetic number, because the mean of its divisors is an integer number (10611612).

Almost surely, 2^206645745 is an apocalyptic number.

It is an amenable number.

206645745 is a deficient number, since it is larger than the sum of its proper divisors (132925839).

206645745 is a wasteful number, since it uses less digits than its factorization.

206645745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1233.

The product of its (nonzero) digits is 201600, while the sum is 39.

The square root of 206645745 is about 14375.1780858534. The cubic root of 206645745 is about 591.2105233429.

The spelling of 206645745 in words is "two hundred six million, six hundred forty-five thousand, seven hundred forty-five".