1998810350869 has 16 divisors (see below), whose sum is σ = 2048615331840. Its totient is φ = 1949791357440.

The previous prime is 1998810350863. The next prime is 1998810350879. The reversal of 1998810350869 is 9680530188991.

It is a cyclic number.

It is not a de Polignac number, because 1998810350869 - 2¹⁹ = 1998809826581 is a prime.

It is a super-2 number, since 2×1998810350869² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998810350863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1524552 + ... + 2514334.

It is an arithmetic number, because the mean of its divisors is an integer number (128038458240).

Almost surely, 2^{1998810350869} is an apocalyptic number.

It is an amenable number.

1998810350869 is a deficient number, since it is larger than the sum of its proper divisors (49804980971).

1998810350869 is a wasteful number, since it uses less digits than its factorization.

1998810350869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990180.

The product of its (nonzero) digits is 33592320, while the sum is 67.

The spelling of 1998810350869 in words is "one trillion, nine hundred ninety-eight billion, eight hundred ten million, three hundred fifty thousand, eight hundred sixty-nine".