206445461865 has 16 divisors (see below), whose sum is σ = 330721056000. Its totient is φ = 109968140672.

The previous prime is 206445461861. The next prime is 206445461891. The reversal of 206445461865 is 568164544602.

It is a cyclic number.

It is not a de Polignac number, because 206445461865 - 2² = 206445461861 is a prime.

It is not an unprimeable number, because it can be changed into a prime (206445461861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8494065 + ... + 8518334.

It is an arithmetic number, because the mean of its divisors is an integer number (20670066000).

Almost surely, 2^206445461865 is an apocalyptic number.

It is an amenable number.

206445461865 is a deficient number, since it is larger than the sum of its proper divisors (124275594135).

206445461865 is a wasteful number, since it uses less digits than its factorization.

206445461865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17013216.

The product of its (nonzero) digits is 5529600, while the sum is 51.

The spelling of 206445461865 in words is "two hundred six billion, four hundred forty-five million, four hundred sixty-one thousand, eight hundred sixty-five".