198997420032 has 288 divisors, whose sum is σ = 598569229440. Its totient is φ = 66049966080.

The previous prime is 198997420031. The next prime is 198997420073. The reversal of 198997420032 is 230024799891.

It is a tau number, because it is divible by the number of its divisors (288).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (198997420031) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 139842873 + ... + 139844295.

It is an arithmetic number, because the mean of its divisors is an integer number (2078365380).

Almost surely, 2^198997420032 is an apocalyptic number.

198997420032 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 198997420032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (299284614720).

198997420032 is an abundant number, since it is smaller than the sum of its proper divisors (399571809408).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

198997420032 is an equidigital number, since it uses as much as digits as its factorization.

198997420032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1741 (or 1709 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 54.

The spelling of 198997420032 in words is "one hundred ninety-eight billion, nine hundred ninety-seven million, four hundred twenty thousand, thirty-two".