198191770540 has 24 divisors (see below), whose sum is σ = 416375446032. Its totient is φ = 79243807680.

The previous prime is 198191770537. The next prime is 198191770547. The reversal of 198191770540 is 45077191891.

It is a happy number.

198191770540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (198191770547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2006859 + ... + 2103298.

It is an arithmetic number, because the mean of its divisors is an integer number (17348976918).

Almost surely, 2^198191770540 is an apocalyptic number.

198191770540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

198191770540 is an abundant number, since it is smaller than the sum of its proper divisors (218183675492).

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

198191770540 is a wasteful number, since it uses less digits than its factorization.

198191770540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4112577 (or 4112575 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 52.

The spelling of 198191770540 in words is "one hundred ninety-eight billion, one hundred ninety-one million, seven hundred seventy thousand, five hundred forty".