999998507299009 has 27 divisors (see below), whose sum is σ = 1037403715967451. Its totient is φ = 963922227125760.

The previous prime is 999998507298997. The next prime is 999998507299019. The reversal of 999998507299009 is 900992705899999.

It is a happy number.

The square root of 999998507299009 is 31622753.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 13 ways, for example, as 76271838890625 + 923726668408384 = 8733375^2 + 30392872^2 .

It is not a de Polignac number, because 999998507299009 - 2⁷ = 999998507298881 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 999998507298899 and 999998507298908.

It is not an unprimeable number, because it can be changed into a prime (999998507299019) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 127534558929 + ... + 127534566769.

Almost surely, 2^{999998507299009} is an apocalyptic number.

999998507299009 is the 31622753-rd square number.

999998507299009 is the 15811377-th centered octagonal number.

It is an amenable number.

999998507299009 is a deficient number, since it is larger than the sum of its proper divisors (37405208668442).

999998507299009 is an frugal number, since it uses more digits than its factorization.

999998507299009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15974 (or 7987 counting only the distinct ones).

The product of its (nonzero) digits is 24106163760, while the sum is 94.

The spelling of 999998507299009 in words is "nine hundred ninety-nine trillion, nine hundred ninety-eight billion, five hundred seven million, two hundred ninety-nine thousand, nine".