445302817821 has 6 divisors (see below), whose sum is σ = 643215181310. Its totient is φ = 296868545208.

The previous prime is 445302817819. The next prime is 445302817831. The reversal of 445302817821 is 128718203544.

445302817821 is a `hidden beast` number, since 4 + 4 + 530 + 28 + 1 + 78 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 222788720025 + 222514097796 = 472005^2 + 471714^2 .

It is not a de Polignac number, because 445302817821 - 2¹ = 445302817819 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (445302817831) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24739045426 + ... + 24739045443.

Almost surely, 2^445302817821 is an apocalyptic number.

It is an amenable number.

445302817821 is a deficient number, since it is larger than the sum of its proper divisors (197912363489).

445302817821 is a wasteful number, since it uses less digits than its factorization.

445302817821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49478090875 (or 49478090872 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 45.

The spelling of 445302817821 in words is "four hundred forty-five billion, three hundred two million, eight hundred seventeen thousand, eight hundred twenty-one".