999768867999 has 16 divisors (see below), whose sum is σ = 1456231841280. Its totient is φ = 605077784960.

The previous prime is 999768867971. The next prime is 999768868069.

It is a happy number.

999768867999 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 999768867999 - 2²³ = 999760479391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999768867949) 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, 21044442 + ... + 21091895.

It is an arithmetic number, because the mean of its divisors is an integer number (91014490080).

Almost surely, 2^999768867999 is an apocalyptic number.

999768867999 is a deficient number, since it is larger than the sum of its proper divisors (456462973281).

999768867999 is a wasteful number, since it uses less digits than its factorization.

999768867999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42137070.

The product of its digits is 59997563136, while the sum is 96.

The spelling of 999768867999 in words is "nine hundred ninety-nine billion, seven hundred sixty-eight million, eight hundred sixty-seven thousand, nine hundred ninety-nine".