206540653 has 16 divisors (see below), whose sum is σ = 231397056. Its totient is φ = 182730240.

The previous prime is 206540641. The next prime is 206540689. The reversal of 206540653 is 356045602.

It is a de Polignac number, because none of the positive numbers 2^k-206540653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206540153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166351 + ... + 167587.

It is an arithmetic number, because the mean of its divisors is an integer number (14462316).

Almost surely, 2^206540653 is an apocalyptic number.

It is an amenable number.

206540653 is a deficient number, since it is larger than the sum of its proper divisors (24856403).

206540653 is a wasteful number, since it uses less digits than its factorization.

206540653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1644.

The product of its (nonzero) digits is 21600, while the sum is 31.

The square root of 206540653 is about 14371.5222923669. The cubic root of 206540653 is about 591.1102841116.

The spelling of 206540653 in words is "two hundred six million, five hundred forty thousand, six hundred fifty-three".