205981178896 has 10 divisors (see below), whose sum is σ = 399088534142. Its totient is φ = 102990589440.

The previous prime is 205981178869. The next prime is 205981178951. The reversal of 205981178896 is 698871189502.

It can be written as a sum of positive squares in only one way, i.e., 119968020496 + 86013158400 = 346364^2 + 293280^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6436911825 + ... + 6436911856.

Almost surely, 2^205981178896 is an apocalyptic number.

It is an amenable number.

205981178896 is a deficient number, since it is larger than the sum of its proper divisors (193107355246).

205981178896 is a wasteful number, since it uses less digits than its factorization.

205981178896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12873823689 (or 12873823683 counting only the distinct ones).

The product of its (nonzero) digits is 17418240, while the sum is 64.

The spelling of 205981178896 in words is "two hundred five billion, nine hundred eighty-one million, one hundred seventy-eight thousand, eight hundred ninety-six".