999299681824 has 24 divisors (see below), whose sum is σ = 2070917105040. Its totient is φ = 473352480576.

The previous prime is 999299681789. The next prime is 999299681839. The reversal of 999299681824 is 428186992999.

It is a Harshad number since it is a multiple of its sum of digits (76).

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, 821791894 + ... + 821793109.

It is an arithmetic number, because the mean of its divisors is an integer number (86288212710).

Almost surely, 2^999299681824 is an apocalyptic number.

It is an amenable number.

999299681824 is an abundant number, since it is smaller than the sum of its proper divisors (1071617423216).

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

999299681824 is a wasteful number, since it uses less digits than its factorization.

999299681824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1643585032 (or 1643585024 counting only the distinct ones).

The product of its digits is 362797056, while the sum is 76.

The spelling of 999299681824 in words is "nine hundred ninety-nine billion, two hundred ninety-nine million, six hundred eighty-one thousand, eight hundred twenty-four".