1998810350867 has 16 divisors (see below), whose sum is σ = 2193788188800. Its totient is φ = 1806053874240.

The previous prime is 1998810350863. The next prime is 1998810350879. The reversal of 1998810350867 is 7680530188991.

It is not a de Polignac number, because 1998810350867 - 2² = 1998810350863 is a prime.

It is a Duffinian 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, 3740759 + ... + 4241567.

It is an arithmetic number, because the mean of its divisors is an integer number (137111761800).

Almost surely, 2^{1998810350867} is an apocalyptic number.

1998810350867 is a deficient number, since it is larger than the sum of its proper divisors (194977837933).

1998810350867 is a wasteful number, since it uses less digits than its factorization.

1998810350867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503026.

The product of its (nonzero) digits is 26127360, while the sum is 65.

The spelling of 1998810350867 in words is "one trillion, nine hundred ninety-eight billion, eight hundred ten million, three hundred fifty thousand, eight hundred sixty-seven".