9556500466881 has 45 divisors (see below), whose sum is σ = 14172048840495. Its totient is φ = 6205470402240.

The previous prime is 9556500466873. The next prime is 9556500466907. The reversal of 9556500466881 is 1886640056559.

It is a happy number.

The square root of 9556500466881 is 3091359.

It is a perfect power (a square), and thus also a powerful number.

9556500466881 is a `hidden beast` number, since 9 + 5 + 5 + 6 + 500 + 46 + 6 + 8 + 81 = 666.

It can be written as a sum of positive squares in 7 ways, for example, as 2194590402225 + 7361910064656 = 1481415^2 + 2713284^2 .

It is not a de Polignac number, because 9556500466881 - 2³ = 9556500466873 is a prime.

It is a super-2 number, since 2×9556500466881² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (9556500466841) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 15589723131 + ... + 15589723743.

Almost surely, 2^{9556500466881} is an apocalyptic number.

9556500466881 is the 3091359-th square number.

9556500466881 is the 1545680-th centered octagonal number.

It is an amenable number.

9556500466881 is a deficient number, since it is larger than the sum of its proper divisors (4615548373614).

9556500466881 is an frugal number, since it uses more digits than its factorization.

9556500466881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1396 (or 657 counting only the distinct ones).

The product of its (nonzero) digits is 62208000, while the sum is 63.

The spelling of 9556500466881 in words is "nine trillion, five hundred fifty-six billion, five hundred million, four hundred sixty-six thousand, eight hundred eighty-one".