999131622720 has 672 divisors, whose sum is σ = 4237546129920. Its totient is φ = 196682895360.

The previous prime is 999131622707. The next prime is 999131622779. The reversal of 999131622720 is 27226131999.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 9780547 + ... + 9882173.

Almost surely, 2^999131622720 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 999131622720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2118773064960).

999131622720 is an abundant number, since it is smaller than the sum of its proper divisors (3238414507200).

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

999131622720 is a wasteful number, since it uses less digits than its factorization.

999131622720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101691 (or 101674 counting only the distinct ones).

The product of its (nonzero) digits is 734832, while the sum is 51.

The spelling of 999131622720 in words is "nine hundred ninety-nine billion, one hundred thirty-one million, six hundred twenty-two thousand, seven hundred twenty".