198454640988 has 24 divisors (see below), whose sum is σ = 463459022208. Its totient is φ = 66094662256.

The previous prime is 198454640983. The next prime is 198454640999. The reversal of 198454640988 is 889046454891.

It is a happy number.

It is a super-2 number, since 2×198454640988² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198454640983) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 7096056 + ... + 7123967.

It is an arithmetic number, because the mean of its divisors is an integer number (19310792592).

Almost surely, 2^198454640988 is an apocalyptic number.

It is an amenable number.

198454640988 is an abundant number, since it is smaller than the sum of its proper divisors (265004381220).

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

198454640988 is a wasteful number, since it uses less digits than its factorization.

198454640988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14221193 (or 14221191 counting only the distinct ones).

The product of its (nonzero) digits is 79626240, while the sum is 66.

The spelling of 198454640988 in words is "one hundred ninety-eight billion, four hundred fifty-four million, six hundred forty thousand, nine hundred eighty-eight".