206561465 has 32 divisors (see below), whose sum is σ = 278885376. Its totient is φ = 145575360.

The previous prime is 206561447. The next prime is 206561473. The reversal of 206561465 is 564165602.

It is not a de Polignac number, because 206561465 - 2²² = 202367161 is a prime.

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, 394694 + ... + 395216.

It is an arithmetic number, because the mean of its divisors is an integer number (8715168).

Almost surely, 2^206561465 is an apocalyptic number.

It is an amenable number.

206561465 is a deficient number, since it is larger than the sum of its proper divisors (72323911).

206561465 is a wasteful number, since it uses less digits than its factorization.

206561465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 749.

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 206561465 is about 14372.2463449525. The cubic root of 206561465 is about 591.1301377883.

The spelling of 206561465 in words is "two hundred six million, five hundred sixty-one thousand, four hundred sixty-five".