206497213665 has 16 divisors (see below), whose sum is σ = 330403400448. Its totient is φ = 110129227776.

The previous prime is 206497213627. The next prime is 206497213673. The reversal of 206497213665 is 566312794602.

It is not a de Polignac number, because 206497213665 - 2⁸ = 206497213409 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, 604104 + ... + 882006.

It is an arithmetic number, because the mean of its divisors is an integer number (20650212528).

Almost surely, 2^206497213665 is an apocalyptic number.

It is an amenable number.

206497213665 is a deficient number, since it is larger than the sum of its proper divisors (123906186783).

206497213665 is a wasteful number, since it uses less digits than its factorization.

206497213665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327448.

The product of its (nonzero) digits is 3265920, while the sum is 51.

The spelling of 206497213665 in words is "two hundred six billion, four hundred ninety-seven million, two hundred thirteen thousand, six hundred sixty-five".