999998999897 has 16 divisors (see below), whose sum is σ = 1011451775760. Its totient is φ = 988578048000.

The previous prime is 999998999887. The next prime is 999998999899. The reversal of 999998999897 is 798999899999.

It can be written as a sum of positive squares in 8 ways, for example, as 1286585161 + 998712414736 = 35869^2 + 999356^2 .

It is a cyclic number.

It is not a de Polignac number, because 999998999897 - 2¹⁴ = 999998983513 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 999998999897.

It is not an unprimeable number, because it can be changed into a prime (999998999899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 314364647 + ... + 314367827.

It is an arithmetic number, because the mean of its divisors is an integer number (63215735985).

Almost surely, 2^999998999897 is an apocalyptic number.

It is an amenable number.

999998999897 is a deficient number, since it is larger than the sum of its proper divisors (11452775863).

999998999897 is a wasteful number, since it uses less digits than its factorization.

999998999897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7084.

The product of its digits is 173564379072, while the sum is 104.

The spelling of 999998999897 in words is "nine hundred ninety-nine billion, nine hundred ninety-eight million, nine hundred ninety-nine thousand, eight hundred ninety-seven".