999969478326 has 432 divisors, whose sum is σ = 2827852975584. Its totient is φ = 253108800000.

The previous prime is 999969478303. The next prime is 999969478373. The reversal of 999969478326 is 623874969999.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 215 ways as a sum of consecutive naturals, for example, 1663842426 + ... + 1663843026.

It is an arithmetic number, because the mean of its divisors is an integer number (6545955962).

Almost surely, 2^999969478326 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999969478326, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1413926487792).

999969478326 is an abundant number, since it is smaller than the sum of its proper divisors (1827883497258).

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

999969478326 is a wasteful number, since it uses less digits than its factorization.

999969478326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 849 (or 808 counting only the distinct ones).

The product of its digits is 2857026816, while the sum is 81.

The spelling of 999969478326 in words is "nine hundred ninety-nine billion, nine hundred sixty-nine million, four hundred seventy-eight thousand, three hundred twenty-six".