1998421553090 has 32 divisors (see below), whose sum is σ = 3720491550720. Its totient is φ = 772062667200.

The previous prime is 1998421553039. The next prime is 1998421553123. The reversal of 1998421553090 is 903551248991.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6174746 + ... + 6490325.

It is an arithmetic number, because the mean of its divisors is an integer number (116265360960).

Almost surely, 2^{1998421553090} is an apocalyptic number.

1998421553090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1998421553090 is a deficient number, since it is larger than the sum of its proper divisors (1722069997630).

1998421553090 is a wasteful number, since it uses less digits than its factorization.

1998421553090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12665618.

The product of its (nonzero) digits is 3499200, while the sum is 56.

The spelling of 1998421553090 in words is "one trillion, nine hundred ninety-eight billion, four hundred twenty-one million, five hundred fifty-three thousand, ninety".