198657217240 has 16 divisors (see below), whose sum is σ = 446978738880. Its totient is φ = 79462886880.

The previous prime is 198657217229. The next prime is 198657217243. The reversal of 198657217240 is 42712756891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198657217243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2483215176 + ... + 2483215255.

It is an arithmetic number, because the mean of its divisors is an integer number (27936171180).

Almost surely, 2^198657217240 is an apocalyptic number.

198657217240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

198657217240 is an abundant number, since it is smaller than the sum of its proper divisors (248321521640).

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

198657217240 is a wasteful number, since it uses less digits than its factorization.

198657217240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4966430442 (or 4966430438 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 52.

The spelling of 198657217240 in words is "one hundred ninety-eight billion, six hundred fifty-seven million, two hundred seventeen thousand, two hundred forty".