4561365581 has 2 divisors, whose sum is σ = 4561365582. Its totient is φ = 4561365580.

The previous prime is 4561365559. The next prime is 4561365593. The reversal of 4561365581 is 1855631654.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3808741225 + 752624356 = 61715^2 + 27434^2 .

It is a cyclic number.

It is not a de Polignac number, because 4561365581 - 2¹⁴ = 4561349197 is a prime.

It is a super-2 number, since 2×4561365581² = 41612111927062935122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4561362581) 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 as a sum of consecutive naturals, namely, 2280682790 + 2280682791.

It is an arithmetic number, because the mean of its divisors is an integer number (2280682791).

Almost surely, 2^4561365581 is an apocalyptic number.

It is an amenable number.

4561365581 is a deficient number, since it is larger than the sum of its proper divisors (1).

4561365581 is an equidigital number, since it uses as much as digits as its factorization.

4561365581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432000, while the sum is 44.

The square root of 4561365581 is about 67537.8825623072. The cubic root of 4561365581 is about 1658.4343855079.

The spelling of 4561365581 in words is "four billion, five hundred sixty-one million, three hundred sixty-five thousand, five hundred eighty-one".