445509473922 has 50 divisors (see below), whose sum is σ = 1002649611183. Its totient is φ = 147854672568.

The previous prime is 445509473873. The next prime is 445509473993. The reversal of 445509473922 is 229374905544.

It is a happy number.

445509473922 is a `hidden beast` number, since 4 + 4 + 5 + 509 + 47 + 3 + 92 + 2 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 417120930801 + 28388543121 = 645849^2 + 168489^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=471969.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 24 ways as a sum of consecutive naturals, for example, 1945456104 + ... + 1945456332.

Almost surely, 2^445509473922 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 445509473922

445509473922 is an abundant number, since it is smaller than the sum of its proper divisors (557140137261).

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

445509473922 is an frugal number, since it uses more digits than its factorization.

445509473922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 930 (or 234 counting only the distinct ones).

The product of its (nonzero) digits is 10886400, while the sum is 54.

The spelling of 445509473922 in words is "four hundred forty-five billion, five hundred nine million, four hundred seventy-three thousand, nine hundred twenty-two".