7445544581 has 2 divisors, whose sum is σ = 7445544582. Its totient is φ = 7445544580.

The previous prime is 7445544539. The next prime is 7445544583. The reversal of 7445544581 is 1854455447.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3729544900 + 3715999681 = 61070^2 + 60959^2 .

It is a cyclic number.

It is not a de Polignac number, because 7445544581 - 2⁶ = 7445544517 is a prime.

It is a super-2 number, since 2×7445544581² (a number of 21 digits) contains 22 as substring.

Together with 7445544583, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7445544583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3722772290 + 3722772291.

It is an arithmetic number, because the mean of its divisors is an integer number (3722772291).

Almost surely, 2^7445544581 is an apocalyptic number.

It is an amenable number.

7445544581 is a deficient number, since it is larger than the sum of its proper divisors (1).

7445544581 is an equidigital number, since it uses as much as digits as its factorization.

7445544581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1792000, while the sum is 47.

The square root of 7445544581 is about 86287.5690989148. The cubic root of 7445544581 is about 1952.6848470292.

The spelling of 7445544581 in words is "seven billion, four hundred forty-five million, five hundred forty-four thousand, five hundred eighty-one".