204445434645 has 16 divisors (see below), whose sum is σ = 363458550720. Its totient is φ = 109037565072.

The previous prime is 204445434637. The next prime is 204445434751. The reversal of 204445434645 is 546434544402.

204445434645 is a `hidden beast` number, since 2 + 0 + 4 + 44 + 543 + 4 + 64 + 5 = 666.

It is not a de Polignac number, because 204445434645 - 2³ = 204445434637 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 204445434645.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 757205179 + ... + 757205448.

It is an arithmetic number, because the mean of its divisors is an integer number (22716159420).

Almost surely, 2^204445434645 is an apocalyptic number.

It is an amenable number.

204445434645 is a deficient number, since it is larger than the sum of its proper divisors (159013116075).

204445434645 is a wasteful number, since it uses less digits than its factorization.

204445434645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1514410641 (or 1514410635 counting only the distinct ones).

The product of its (nonzero) digits is 3686400, while the sum is 45.

The spelling of 204445434645 in words is "two hundred four billion, four hundred forty-five million, four hundred thirty-four thousand, six hundred forty-five".