4018081581 has 6 divisors (see below), whose sum is σ = 5803895630. Its totient is φ = 2678721048.

The previous prime is 4018081579. The next prime is 4018081607. The reversal of 4018081581 is 1851808104.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 3031493481 + 986588100 = 55059^2 + 31410^2 .

It is not a de Polignac number, because 4018081581 - 2¹ = 4018081579 is a prime.

It is a super-2 number, since 2×4018081581² = 32289959183142919122, which 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 (4018081481) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 223226746 + ... + 223226763.

Almost surely, 2^4018081581 is an apocalyptic number.

It is an amenable number.

4018081581 is a deficient number, since it is larger than the sum of its proper divisors (1785814049).

4018081581 is a wasteful number, since it uses less digits than its factorization.

4018081581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446453515 (or 446453512 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 36.

The square root of 4018081581 is about 63388.3394718619. The cubic root of 4018081581 is about 1589.7893502826.

Adding to 4018081581 its reverse (1851808104), we get a palindrome (5869889685).

The spelling of 4018081581 in words is "four billion, eighteen million, eighty-one thousand, five hundred eighty-one".