205539399825 has 12 divisors (see below), whose sum is σ = 339825141168. Its totient is φ = 109621013200.

The previous prime is 205539399809. The next prime is 205539399829. The reversal of 205539399825 is 528993935502.

It is not a de Polignac number, because 205539399825 - 2⁴ = 205539399809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (205539399829) 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, 1370262591 + ... + 1370262740.

It is an arithmetic number, because the mean of its divisors is an integer number (28318761764).

Almost surely, 2^205539399825 is an apocalyptic number.

205539399825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

205539399825 is a deficient number, since it is larger than the sum of its proper divisors (134285741343).

205539399825 is a wasteful number, since it uses less digits than its factorization.

205539399825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2740525344 (or 2740525339 counting only the distinct ones).

The product of its (nonzero) digits is 26244000, while the sum is 60.

The spelling of 205539399825 in words is "two hundred five billion, five hundred thirty-nine million, three hundred ninety-nine thousand, eight hundred twenty-five".