205449618128 has 40 divisors (see below), whose sum is σ = 409142646528. Its totient is φ = 99885848832.

The previous prime is 205449618109. The next prime is 205449618151. The reversal of 205449618128 is 821816944502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 516125 + ... + 822972.

Almost surely, 2^205449618128 is an apocalyptic number.

It is an amenable number.

205449618128 is a deficient number, since it is larger than the sum of its proper divisors (203693028400).

205449618128 is a wasteful number, since it uses less digits than its factorization.

205449618128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1339371 (or 1339365 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 50.

The spelling of 205449618128 in words is "two hundred five billion, four hundred forty-nine million, six hundred eighteen thousand, one hundred twenty-eight".