205939087849 has 8 divisors (see below), whose sum is σ = 224752888800. Its totient is φ = 187140631200.

The previous prime is 205939087829. The next prime is 205939087919. The reversal of 205939087849 is 948780939502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 205939087849 - 2⁷ = 205939087721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (205939087829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3807999 + ... + 3861700.

It is an arithmetic number, because the mean of its divisors is an integer number (28094111100).

Almost surely, 2^205939087849 is an apocalyptic number.

It is an amenable number.

205939087849 is a deficient number, since it is larger than the sum of its proper divisors (18813800951).

205939087849 is a wasteful number, since it uses less digits than its factorization.

205939087849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7672151.

The product of its (nonzero) digits is 39191040, while the sum is 64.

The spelling of 205939087849 in words is "two hundred five billion, nine hundred thirty-nine million, eighty-seven thousand, eight hundred forty-nine".