1998786521110 has 16 divisors (see below), whose sum is σ = 3599077738032. Its totient is φ = 799234164000.

The previous prime is 1998786521093. The next prime is 1998786521209. The reversal of 1998786521110 is 111256878991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35025621 + ... + 35082640.

It is an arithmetic number, because the mean of its divisors is an integer number (224942358627).

Almost surely, 2^{1998786521110} is an apocalyptic number.

1998786521110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1998786521110 is a deficient number, since it is larger than the sum of its proper divisors (1600291216922).

1998786521110 is a wasteful number, since it uses less digits than its factorization.

1998786521110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70111119.

The product of its (nonzero) digits is 2177280, while the sum is 58.

The spelling of 1998786521110 in words is "one trillion, nine hundred ninety-eight billion, seven hundred eighty-six million, five hundred twenty-one thousand, one hundred ten".