44554445581 has 2 divisors, whose sum is σ = 44554445582. Its totient is φ = 44554445580.

The previous prime is 44554445531. The next prime is 44554445641. The reversal of 44554445581 is 18554445544.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27042158025 + 17512287556 = 164445^2 + 132334^2 .

It is a cyclic number.

It is not a de Polignac number, because 44554445581 - 2¹¹ = 44554443533 is a prime.

It is a super-2 number, since 2×44554445581² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (44554445531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22277222790 + 22277222791.

It is an arithmetic number, because the mean of its divisors is an integer number (22277222791).

Almost surely, 2^44554445581 is an apocalyptic number.

It is an amenable number.

44554445581 is a deficient number, since it is larger than the sum of its proper divisors (1).

44554445581 is an equidigital number, since it uses as much as digits as its factorization.

44554445581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5120000, while the sum is 49.

The spelling of 44554445581 in words is "forty-four billion, five hundred fifty-four million, four hundred forty-five thousand, five hundred eighty-one".