444145784581 has 16 divisors (see below), whose sum is σ = 454275993600. Its totient is φ = 434133795888.

The previous prime is 444145784561. The next prime is 444145784611. The reversal of 444145784581 is 185487541444.

It is a cyclic number.

It is not a de Polignac number, because 444145784581 - 2²⁷ = 444011566853 is a prime.

It is a super-2 number, since 2×444145784581² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (444145784531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13161376 + ... + 13195078.

It is an arithmetic number, because the mean of its divisors is an integer number (28392249600).

Almost surely, 2^444145784581 is an apocalyptic number.

It is an amenable number.

444145784581 is a deficient number, since it is larger than the sum of its proper divisors (10130209019).

444145784581 is a wasteful number, since it uses less digits than its factorization.

444145784581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35448.

The product of its digits is 11468800, while the sum is 55.

The spelling of 444145784581 in words is "four hundred forty-four billion, one hundred forty-five million, seven hundred eighty-four thousand, five hundred eighty-one".