205995668004 has 72 divisors (see below), whose sum is σ = 604854356288. Its totient is φ = 57891049920.

The previous prime is 205995667987. The next prime is 205995668017. The reversal of 205995668004 is 400866599502.

It is a happy number.

205995668004 is a `hidden beast` number, since 20 + 59 + 9 + 566 + 8 + 0 + 0 + 4 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6684982 + ... + 6715725.

Almost surely, 2^205995668004 is an apocalyptic number.

It is an amenable number.

205995668004 is an abundant number, since it is smaller than the sum of its proper divisors (398858688284).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

205995668004 is a wasteful number, since it uses less digits than its factorization.

205995668004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13400785 (or 13400780 counting only the distinct ones).

The product of its (nonzero) digits is 4665600, while the sum is 54.

The spelling of 205995668004 in words is "two hundred five billion, nine hundred ninety-five million, six hundred sixty-eight thousand, four".