99999906636 has 96 divisors (see below), whose sum is σ = 273151936512. Its totient is φ = 27880151040.

The previous prime is 99999906593. The next prime is 99999906641. The reversal of 99999906636 is 63660999999.

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, 1292896 + ... + 1368056.

It is an arithmetic number, because the mean of its divisors is an integer number (2845332672).

Almost surely, 2^99999906636 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99999906636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136575968256).

99999906636 is an abundant number, since it is smaller than the sum of its proper divisors (173152029876).

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

99999906636 is a wasteful number, since it uses less digits than its factorization.

99999906636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75559 (or 75557 counting only the distinct ones).

The product of its (nonzero) digits is 344373768, while the sum is 75.

The spelling of 99999906636 in words is "ninety-nine billion, nine hundred ninety-nine million, nine hundred six thousand, six hundred thirty-six".