1998331791007 has 12 divisors (see below), whose sum is σ = 2089414954080. Its totient is φ = 1910329961568.

The previous prime is 1998331790971. The next prime is 1998331791067. The reversal of 1998331791007 is 7001971338991.

It is not a de Polignac number, because 1998331791007 - 2⁷ = 1998331790879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998331791067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11410582 + ... + 11584387.

It is an arithmetic number, because the mean of its divisors is an integer number (174117912840).

Almost surely, 2^{1998331791007} is an apocalyptic number.

1998331791007 is a deficient number, since it is larger than the sum of its proper divisors (91083163073).

1998331791007 is an equidigital number, since it uses as much as digits as its factorization.

1998331791007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22995102 (or 22995059 counting only the distinct ones).

The product of its (nonzero) digits is 2571912, while the sum is 58.

The spelling of 1998331791007 in words is "one trillion, nine hundred ninety-eight billion, three hundred thirty-one million, seven hundred ninety-one thousand, seven".