999888888667 has 16 divisors (see below), whose sum is σ = 1084012554240. Its totient is φ = 918604778112.

The previous prime is 999888888619. The next prime is 999888888673. The reversal of 999888888667 is 766888888999.

It is a happy number.

999888888667 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 999888888667 - 2¹⁵ = 999888855899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999888888697) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 725134 + ... + 1589212.

It is an arithmetic number, because the mean of its divisors is an integer number (67750784640).

Almost surely, 2^999888888667 is an apocalyptic number.

999888888667 is a deficient number, since it is larger than the sum of its proper divisors (84123665573).

999888888667 is a wasteful number, since it uses less digits than its factorization.

999888888667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865722.

The product of its digits is 48157949952, while the sum is 94.

The spelling of 999888888667 in words is "nine hundred ninety-nine billion, eight hundred eighty-eight million, eight hundred eighty-eight thousand, six hundred sixty-seven".