999667403316288 has 672 divisors, whose sum is σ = 3690039729725440. Its totient is φ = 261858046648320.

The previous prime is 999667403316217. The next prime is 999667403316289. The reversal of 999667403316288 is 882613304766999.

999667403316288 is a `hidden beast` number, since 9 + 9 + 96 + 67 + 4 + 0 + 331 + 62 + 88 = 666.

It is a tau number, because it is divible by the number of its divisors (672).

It is a Harshad number since it is a multiple of its sum of digits (81).

It is not an unprimeable number, because it can be changed into a prime (999667403316289) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 56325720 + ... + 71916072.

Almost surely, 2^{999667403316288} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999667403316288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1845019864862720).

999667403316288 is an abundant number, since it is smaller than the sum of its proper divisors (2690372326409152).

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

999667403316288 is a wasteful number, since it uses less digits than its factorization.

999667403316288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15590437 (or 15590415 counting only the distinct ones).

The product of its (nonzero) digits is 5079158784, while the sum is 81.

The spelling of 999667403316288 in words is "nine hundred ninety-nine trillion, six hundred sixty-seven billion, four hundred three million, three hundred sixteen thousand, two hundred eighty-eight".