99990006666 has 128 divisors (see below), whose sum is σ = 240813637632. Its totient is φ = 27323520000.

The previous prime is 99990006643. The next prime is 99990006671. The reversal of 99990006666 is 66660009999.

99990006666 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

99990006666 is a strobogrammatic number because it is the same when read upside-down.

It is a zygodrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3498751 + ... + 3527213.

It is an arithmetic number, because the mean of its divisors is an integer number (1881356544).

Almost surely, 2^99990006666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99990006666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120406818816).

99990006666 is an abundant number, since it is smaller than the sum of its proper divisors (140823630966).

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

99990006666 is a wasteful number, since it uses less digits than its factorization.

99990006666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28628.

The product of its (nonzero) digits is 8503056, while the sum is 60.

The spelling of 99990006666 in words is "ninety-nine billion, nine hundred ninety million, six thousand, six hundred sixty-six".