205446440644 has 9 divisors (see below), whose sum is σ = 359532857551. Its totient is φ = 102722767060.

The previous prime is 205446440627. The next prime is 205446440653. The reversal of 205446440644 is 446044644502.

The square root of 205446440644 is 453262.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 205446440644.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 793209 + ... + 1019839.

Almost surely, 2^205446440644 is an apocalyptic number.

205446440644 is the 453262-nd square number.

It is an amenable number.

205446440644 is a deficient number, since it is larger than the sum of its proper divisors (154086416907).

205446440644 is an frugal number, since it uses more digits than its factorization.

205446440644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453266 (or 226633 counting only the distinct ones).

The product of its (nonzero) digits is 1474560, while the sum is 43.

The spelling of 205446440644 in words is "two hundred five billion, four hundred forty-six million, four hundred forty thousand, six hundred forty-four".