999900111006666 has 12 divisors (see below), whose sum is σ = 2166450240514482. Its totient is φ = 333300037002216.

The previous prime is 999900111006631. The next prime is 999900111006679. The reversal of 999900111006666 is 666600111009999.

It can be written as a sum of positive squares in only one way, i.e., 978734268603441 + 21165842403225 = 31284729^2 + 4600635^2 .

It is a super-2 number, since 2×999900111006666² (a number of 31 digits) contains 22 as substring.

999900111006666 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 pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27775003083501 + ... + 27775003083536.

Almost surely, 2^{999900111006666} is an apocalyptic number.

999900111006666 is an abundant number, since it is smaller than the sum of its proper divisors (1166550129507816).

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

999900111006666 is a wasteful number, since it uses less digits than its factorization.

999900111006666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55550006167045 (or 55550006167042 counting only the distinct ones).

The product of its (nonzero) digits is 8503056, while the sum is 63.

The spelling of 999900111006666 in words is "nine hundred ninety-nine trillion, nine hundred billion, one hundred eleven million, six thousand, six hundred sixty-six".