198691621220 has 48 divisors (see below), whose sum is σ = 436943541888. Its totient is φ = 75750554880.

The previous prime is 198691621057. The next prime is 198691621253. The reversal of 198691621220 is 22126196891.

It is a happy number.

It is an unprimeable number.

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, 639314 + ... + 897833.

It is an arithmetic number, because the mean of its divisors is an integer number (9102990456).

Almost surely, 2^198691621220 is an apocalyptic number.

198691621220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

198691621220 is an abundant number, since it is smaller than the sum of its proper divisors (238251920668).

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

198691621220 is a wasteful number, since it uses less digits than its factorization.

198691621220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1537460 (or 1537458 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 47.

The spelling of 198691621220 in words is "one hundred ninety-eight billion, six hundred ninety-one million, six hundred twenty-one thousand, two hundred twenty".