206765309505 has 32 divisors (see below), whose sum is σ = 353498428800. Its totient is φ = 102835878912.

The previous prime is 206765309473. The next prime is 206765309551. The reversal of 206765309505 is 505903567602.

It is not a de Polignac number, because 206765309505 - 2⁵ = 206765309473 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, 3691675 + ... + 3747264.

It is an arithmetic number, because the mean of its divisors is an integer number (11046825900).

Almost surely, 2^206765309505 is an apocalyptic number.

It is an amenable number.

206765309505 is a deficient number, since it is larger than the sum of its proper divisors (146733119295).

206765309505 is a wasteful number, since it uses less digits than its factorization.

206765309505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7439073.

The product of its (nonzero) digits is 1701000, while the sum is 48.

The spelling of 206765309505 in words is "two hundred six billion, seven hundred sixty-five million, three hundred nine thousand, five hundred five".