99998886666 has 32 divisors (see below), whose sum is σ = 228776214528. Its totient is φ = 28545194160.

The previous prime is 99998886661. The next prime is 99998886677. The reversal of 99998886666 is 66668889999.

99998886666 is a strobogrammatic number because it is the same when read upside-down.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (99998886661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1032970 + ... + 1125621.

It is an arithmetic number, because the mean of its divisors is an integer number (7149256704).

Almost surely, 2^99998886666 is an apocalyptic number.

99998886666 is an abundant number, since it is smaller than the sum of its proper divisors (128777327862).

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

99998886666 is a wasteful number, since it uses less digits than its factorization.

99998886666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2159706.

The product of its digits is 4353564672, while the sum is 84.

The spelling of 99998886666 in words is "ninety-nine billion, nine hundred ninety-eight million, eight hundred eighty-six thousand, six hundred sixty-six".