99660009966 has 48 divisors (see below), whose sum is σ = 220538446464. Its totient is φ = 29999970000.

The previous prime is 99660009947. The next prime is 99660009973. The reversal of 99660009966 is 66990006699.

99660009966 is a strobogrammatic number because it is the same when read upside-down.

It is a zygodrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 344920 + ... + 564171.

It is an arithmetic number, because the mean of its divisors is an integer number (4594550968).

Almost surely, 2^99660009966 is an apocalyptic number.

99660009966 is an abundant number, since it is smaller than the sum of its proper divisors (120878436498).

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

99660009966 is a wasteful number, since it uses less digits than its factorization.

99660009966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909269 (or 909258 counting only the distinct ones).

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

The spelling of 99660009966 in words is "ninety-nine billion, six hundred sixty million, nine thousand, nine hundred sixty-six".