1999628017298 has 6 divisors (see below), whose sum is σ = 2999445025671. Its totient is φ = 999813008742.

The previous prime is 1999628017291. The next prime is 1999628017307. The reversal of 1999628017298 is 8927108269991.

It can be written as a sum of positive squares in only one way, i.e., 999814008649 + 999814008649 = 999907^2 + 999907^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=999907.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1999628017291) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1499861 + ... + 2499767.

Almost surely, 2^{1999628017298} is an apocalyptic number.

1999628017298 is a deficient number, since it is larger than the sum of its proper divisors (999817008373).

1999628017298 is an frugal number, since it uses more digits than its factorization.

1999628017298 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1999816 (or 999909 counting only the distinct ones).

The product of its (nonzero) digits is 70543872, while the sum is 71.

The spelling of 1999628017298 in words is "one trillion, nine hundred ninety-nine billion, six hundred twenty-eight million, seventeen thousand, two hundred ninety-eight".