9160816581 has 80 divisors (see below), whose sum is σ = 15998345088. Its totient is φ = 5115830400.

The previous prime is 9160816559. The next prime is 9160816589. The reversal of 9160816581 is 1856180619.

9160816581 is a `hidden beast` number, since 9 + 1 + 60 + 8 + 1 + 6 + 581 = 666.

It is not a de Polignac number, because 9160816581 - 2⁶ = 9160816517 is a prime.

It is a super-2 number, since 2×9160816581² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9160816589) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 5982786 + ... + 5984316.

Almost surely, 2^9160816581 is an apocalyptic number.

It is an amenable number.

9160816581 is a deficient number, since it is larger than the sum of its proper divisors (6837528507).

9160816581 is a wasteful number, since it uses less digits than its factorization.

9160816581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1784 (or 1775 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 45.

The square root of 9160816581 is about 95712.1548237213. The cubic root of 9160816581 is about 2092.4000861840.

The spelling of 9160816581 in words is "nine billion, one hundred sixty million, eight hundred sixteen thousand, five hundred eighty-one".