206642345 has 16 divisors (see below), whose sum is σ = 305195520. Its totient is φ = 130797504.

The previous prime is 206642297. The next prime is 206642351. The reversal of 206642345 is 543246602.

It is a cyclic number.

It is not a de Polignac number, because 206642345 - 2²⁶ = 139533481 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 226625 + ... + 227534.

It is an arithmetic number, because the mean of its divisors is an integer number (19074720).

Almost surely, 2^206642345 is an apocalyptic number.

It is an amenable number.

206642345 is a deficient number, since it is larger than the sum of its proper divisors (98553175).

206642345 is a wasteful number, since it uses less digits than its factorization.

206642345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454184.

The product of its (nonzero) digits is 34560, while the sum is 32.

The square root of 206642345 is about 14375.0598259625. The cubic root of 206642345 is about 591.2072808746.

Adding to 206642345 its reverse (543246602), we get a palindrome (749888947).

The spelling of 206642345 in words is "two hundred six million, six hundred forty-two thousand, three hundred forty-five".