999999970000000 has 256 divisors, whose sum is σ = 2492180239142880. Its totient is φ = 399686400000000.

The previous prime is 999999969999949. The next prime is 999999970000007. The reversal of 999999970000000 is 79999999.

It can be written as a sum of positive squares in 16 ways, for example, as 777757946209344 + 222242023790656 = 27888312^2 + 14907784^2 .

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (999999970000007) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12969961450 + ... + 12970038550.

Almost surely, 2^{999999970000000} is an apocalyptic number.

999999970000000 is the 20000000-th heptagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999999970000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1246090119571440).

999999970000000 is an abundant number, since it is smaller than the sum of its proper divisors (1492180269142880).

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

999999970000000 is an frugal number, since it uses more digits than its factorization.

999999970000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78447 (or 78405 counting only the distinct ones).

The product of its (nonzero) digits is 33480783, while the sum is 70.

The spelling of 999999970000000 in words is "nine hundred ninety-nine trillion, nine hundred ninety-nine billion, nine hundred seventy million", and thus it is an aban number.