205289740065 has 16 divisors (see below), whose sum is σ = 329684644800. Its totient is φ = 109080841152.

The previous prime is 205289739973. The next prime is 205289740067. The reversal of 205289740065 is 560047982502.

It is not a de Polignac number, because 205289740065 - 2²¹ = 205287642913 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 205289739996 and 205289740023.

It is not an unprimeable number, because it can be changed into a prime (205289740067) 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, 25434595 + ... + 25442664.

It is an arithmetic number, because the mean of its divisors is an integer number (20605290300).

Almost surely, 2^205289740065 is an apocalyptic number.

It is an amenable number.

205289740065 is a deficient number, since it is larger than the sum of its proper divisors (124394904735).

205289740065 is a wasteful number, since it uses less digits than its factorization.

205289740065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50877536.

The product of its (nonzero) digits is 1209600, while the sum is 48.

The spelling of 205289740065 in words is "two hundred five billion, two hundred eighty-nine million, seven hundred forty thousand, sixty-five".