9159965581 has 16 divisors (see below), whose sum is σ = 9944363520. Its totient is φ = 8387245440.

The previous prime is 9159965561. The next prime is 9159965593. The reversal of 9159965581 is 1855699519.

It is a cyclic number.

It is not a de Polignac number, because 9159965581 - 2²¹ = 9157868429 is a prime.

It is a super-2 number, since 2×9159965581² (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 (9159965561) 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, 815280 + ... + 826438.

It is an arithmetic number, because the mean of its divisors is an integer number (621522720).

Almost surely, 2^9159965581 is an apocalyptic number.

It is an amenable number.

9159965581 is a deficient number, since it is larger than the sum of its proper divisors (784397939).

9159965581 is a wasteful number, since it uses less digits than its factorization.

9159965581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11676.

The product of its digits is 4374000, while the sum is 58.

The square root of 9159965581 is about 95707.7090991107. The cubic root of 9159965581 is about 2092.3352925564.

The spelling of 9159965581 in words is "nine billion, one hundred fifty-nine million, nine hundred sixty-five thousand, five hundred eighty-one".