9945521712 has 160 divisors (see below), whose sum is σ = 32949557760. Its totient is φ = 2813356800.

The previous prime is 9945521699. The next prime is 9945521731. The reversal of 9945521712 is 2171255499.

9945521712 is a `hidden beast` number, since 9 + 94 + 552 + 1 + 7 + 1 + 2 = 666.

It is a super-4 number, since 4×9945521712⁴ (a number of 41 digits) contains 4444 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 289143 + ... + 321705.

It is an arithmetic number, because the mean of its divisors is an integer number (205934736).

Almost surely, 2^9945521712 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 9945521712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16474778880).

9945521712 is an abundant number, since it is smaller than the sum of its proper divisors (23004036048).

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

9945521712 is a wasteful number, since it uses less digits than its factorization.

9945521712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32688 (or 32676 counting only the distinct ones).

The product of its digits is 226800, while the sum is 45.

The square root of 9945521712 is about 99727.2365605304. The cubic root of 9945521712 is about 2150.5152334315.

The spelling of 9945521712 in words is "nine billion, nine hundred forty-five million, five hundred twenty-one thousand, seven hundred twelve".