999998999966 has 8 divisors (see below), whose sum is σ = 1578945789480. Its totient is φ = 473683736808.

The previous prime is 999998999957. The next prime is 999998999999. The reversal of 999998999966 is 669999899999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13157881541 + ... + 13157881616.

It is an arithmetic number, because the mean of its divisors is an integer number (197368223685).

Almost surely, 2^999998999966 is an apocalyptic number.

999998999966 is a deficient number, since it is larger than the sum of its proper divisors (578946789514).

999998999966 is a wasteful number, since it uses less digits than its factorization.

999998999966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26315763178.

The product of its digits is 111577100832, while the sum is 101.

The spelling of 999998999966 in words is "nine hundred ninety-nine billion, nine hundred ninety-eight million, nine hundred ninety-nine thousand, nine hundred sixty-six".