666668899998 has 24 divisors (see below), whose sum is σ = 1520472930600. Its totient is φ = 210527020944.

The previous prime is 666668899987. The next prime is 666668900003. The reversal of 666668899998 is 899998866666.

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 11 ways as a sum of consecutive naturals, for example, 974661793 + ... + 974662476.

It is an arithmetic number, because the mean of its divisors is an integer number (63353038775).

Almost surely, 2^666668899998 is an apocalyptic number.

666668899998 is an abundant number, since it is smaller than the sum of its proper divisors (853804030602).

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

666668899998 is a wasteful number, since it uses less digits than its factorization.

666668899998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1949324296 (or 1949324293 counting only the distinct ones).

The product of its digits is 26121388032, while the sum is 90.

The spelling of 666668899998 in words is "six hundred sixty-six billion, six hundred sixty-eight million, eight hundred ninety-nine thousand, nine hundred ninety-eight".