5591165581 has 16 divisors (see below), whose sum is σ = 6010599168. Its totient is φ = 5181971200.

The previous prime is 5591165579. The next prime is 5591165597. The reversal of 5591165581 is 1855611955.

It is a cyclic number.

It is not a de Polignac number, because 5591165581 - 2¹ = 5591165579 is a prime.

It is a super-2 number, since 2×5591165581² = 62522265108318135122, 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 (5591165551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1242171 + ... + 1246663.

It is an arithmetic number, because the mean of its divisors is an integer number (375662448).

Almost surely, 2^5591165581 is an apocalyptic number.

It is an amenable number.

5591165581 is a deficient number, since it is larger than the sum of its proper divisors (419433587).

5591165581 is a wasteful number, since it uses less digits than its factorization.

5591165581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5612.

The product of its digits is 270000, while the sum is 46.

The square root of 5591165581 is about 74774.0969922071. The cubic root of 5591165581 is about 1774.8736886643.

The spelling of 5591165581 in words is "five billion, five hundred ninety-one million, one hundred sixty-five thousand, five hundred eighty-one".