9661356432 has 320 divisors, whose sum is σ = 34782773760. Its totient is φ = 2499434496.

The previous prime is 9661356413. The next prime is 9661356437. The reversal of 9661356432 is 2346531669.

It is a super-2 number, since 2×9661356432² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (9661356437) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2081218 + ... + 2085854.

It is an arithmetic number, because the mean of its divisors is an integer number (108696168).

Almost surely, 2^9661356432 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9661356432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17391386880).

9661356432 is an abundant number, since it is smaller than the sum of its proper divisors (25121417328).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9661356432 is a wasteful number, since it uses less digits than its factorization.

9661356432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4727 (or 4715 counting only the distinct ones).

The product of its digits is 699840, while the sum is 45.

The square root of 9661356432 is about 98292.1992428697. The cubic root of 9661356432 is about 2129.8353691444.

The spelling of 9661356432 in words is "nine billion, six hundred sixty-one million, three hundred fifty-six thousand, four hundred thirty-two".