9906549906 has 64 divisors (see below), whose sum is σ = 22392225792. Its totient is φ = 2894640000.

The previous prime is 9906549889. The next prime is 9906549907. The reversal of 9906549906 is 6099456099.

It is not an unprimeable number, because it can be changed into a prime (9906549907) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 566311 + ... + 583541.

It is an arithmetic number, because the mean of its divisors is an integer number (349878528).

Almost surely, 2^9906549906 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9906549906, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11196112896).

9906549906 is an abundant number, since it is smaller than the sum of its proper divisors (12485675886).

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

9906549906 is a wasteful number, since it uses less digits than its factorization.

9906549906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17559.

The product of its (nonzero) digits is 4723920, while the sum is 57.

The square root of 9906549906 is about 99531.6527844283. The cubic root of 9906549906 is about 2147.7026050025.

The spelling of 9906549906 in words is "nine billion, nine hundred six million, five hundred forty-nine thousand, nine hundred six".