9445444661 has 16 divisors (see below), whose sum is σ = 10118908800. Its totient is φ = 8796490560.

The previous prime is 9445444649. The next prime is 9445444667. The reversal of 9445444661 is 1664445449.

9445444661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-9445444661 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 (9445444667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130115 + ... + 189263.

It is an arithmetic number, because the mean of its divisors is an integer number (632431800).

Almost surely, 2^9445444661 is an apocalyptic number.

It is an amenable number.

9445444661 is a deficient number, since it is larger than the sum of its proper divisors (673464139).

9445444661 is a wasteful number, since it uses less digits than its factorization.

9445444661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59356.

The product of its digits is 1658880, while the sum is 47.

The square root of 9445444661 is about 97187.6775162366. The cubic root of 9445444661 is about 2113.8498524820.

The spelling of 9445444661 in words is "nine billion, four hundred forty-five million, four hundred forty-four thousand, six hundred sixty-one".