9909929918 has 64 divisors (see below), whose sum is σ = 18388435968. Its totient is φ = 3909235200.

The previous prime is 9909929899. The next prime is 9909929947. The reversal of 9909929918 is 8199299099.

It is a Curzon number.

It is a congruent number.

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, 1992671 + ... + 1997637.

It is an arithmetic number, because the mean of its divisors is an integer number (287319312).

Almost surely, 2^9909929918 is an apocalyptic number.

9909929918 is a deficient number, since it is larger than the sum of its proper divisors (8478506050).

9909929918 is a wasteful number, since it uses less digits than its factorization.

9909929918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5177.

The product of its (nonzero) digits is 8503056, while the sum is 65.

The square root of 9909929918 is about 99548.6309197670. The cubic root of 9909929918 is about 2147.9468351737.

The spelling of 9909929918 in words is "nine billion, nine hundred nine million, nine hundred twenty-nine thousand, nine hundred eighteen".