9999939810606 has 16 divisors (see below), whose sum is σ = 20004782803200. Its totient is φ = 3332496073208.

The previous prime is 9999939810569. The next prime is 9999939810607. The reversal of 9999939810606 is 6060189399999.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9999939810607) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 204272736 + ... + 204321683.

It is an arithmetic number, because the mean of its divisors is an integer number (1250298925200).

Almost surely, 2^{9999939810606} is an apocalyptic number.

9999939810606 is an abundant number, since it is smaller than the sum of its proper divisors (10004842992594).

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

9999939810606 is a wasteful number, since it uses less digits than its factorization.

9999939810606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408598503.

The product of its (nonzero) digits is 459165024, while the sum is 78.

The spelling of 9999939810606 in words is "nine trillion, nine hundred ninety-nine billion, nine hundred thirty-nine million, eight hundred ten thousand, six hundred six".