999999888666667 has 4 divisors (see below), whose sum is σ = 1142857015619056. Its totient is φ = 857142761714280.

The previous prime is 999999888666637. The next prime is 999999888666673. The reversal of 999999888666667 is 766666888999999.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 999999888666667 - 2³⁵ = 999965528928299 is a prime.

It is a super-2 number, since 2×999999888666667² (a number of 31 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999999888666637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71428563476184 + ... + 71428563476197.

It is an arithmetic number, because the mean of its divisors is an integer number (285714253904764).

Almost surely, 2^{999999888666667} is an apocalyptic number.

999999888666667 is a deficient number, since it is larger than the sum of its proper divisors (142857126952389).

999999888666667 is a wasteful number, since it uses less digits than its factorization.

999999888666667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142857126952388.

The product of its digits is 14810827014144, while the sum is 115.

The spelling of 999999888666667 in words is "nine hundred ninety-nine trillion, nine hundred ninety-nine billion, eight hundred eighty-eight million, six hundred sixty-six thousand, six hundred sixty-seven".