205456538589 has 32 divisors (see below), whose sum is σ = 291925831680. Its totient is φ = 128158411392.

The previous prime is 205456538569. The next prime is 205456538603. The reversal of 205456538589 is 985835654502.

It is not a de Polignac number, because 205456538589 - 2⁵ = 205456538557 is a prime.

It is a super-2 number, since 2×205456538589² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205456538509) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24062329 + ... + 24070865.

It is an arithmetic number, because the mean of its divisors is an integer number (9122682240).

Almost surely, 2^205456538589 is an apocalyptic number.

It is an amenable number.

205456538589 is a deficient number, since it is larger than the sum of its proper divisors (86469293091).

205456538589 is a wasteful number, since it uses less digits than its factorization.

205456538589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13729.

The product of its (nonzero) digits is 51840000, while the sum is 60.

The spelling of 205456538589 in words is "two hundred five billion, four hundred fifty-six million, five hundred thirty-eight thousand, five hundred eighty-nine".