999698000000 has 504 divisors, whose sum is σ = 2924847424755. Its totient is φ = 339360000000.

The previous prime is 999697999987. The next prime is 999698000071. The reversal of 999698000000 is 896999.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 11 ways, for example, as 342262441024 + 657435558976 = 585032^2 + 810824^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=707000.

It is a Harshad number since it is a multiple of its sum of digits (50).

It is an unprimeable number.

It is a polite number, since it can be written in 62 ways as a sum of consecutive naturals, for example, 9897999950 + ... + 9898000050.

Almost surely, 2^999698000000 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 999698000000

999698000000 is an abundant number, since it is smaller than the sum of its proper divisors (1925149424755).

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

999698000000 is an frugal number, since it uses more digits than its factorization.

999698000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260 (or 115 counting only the distinct ones).

The product of its (nonzero) digits is 314928, while the sum is 50.

Multiplying 999698000000 by its sum of digits (50), we get a square (49984900000000 = 7070000²).

999698000000 divided by its sum of digits (50) gives a square (19993960000 = 141400²).

Adding to 999698000000 its reverse (896999), we get a palindrome (999698896999).

The spelling of 999698000000 in words is "nine hundred ninety-nine billion, six hundred ninety-eight million", and thus it is an aban number.