205809031769 has 12 divisors (see below), whose sum is σ = 226268571648. Its totient is φ = 187058819640.

The previous prime is 205809031751. The next prime is 205809031819. The reversal of 205809031769 is 967130908502.

It is not a de Polignac number, because 205809031769 - 2²⁴ = 205792254553 is a prime.

It is a super-2 number, since 2×205809031769² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205809031069) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 388232 + ... + 749894.

It is an arithmetic number, because the mean of its divisors is an integer number (18855714304).

Almost surely, 2^205809031769 is an apocalyptic number.

It is an amenable number.

205809031769 is a deficient number, since it is larger than the sum of its proper divisors (20459539879).

205809031769 is a wasteful number, since it uses less digits than its factorization.

205809031769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366388 (or 366377 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 50.

The spelling of 205809031769 in words is "two hundred five billion, eight hundred nine million, thirty-one thousand, seven hundred sixty-nine".