198527779872 has 96 divisors (see below), whose sum is σ = 581784154560. Its totient is φ = 65862236160.

The previous prime is 198527779847. The next prime is 198527779889. The reversal of 198527779872 is 278977725891.

198527779872 is a `hidden beast` number, since 1 + 9 + 8 + 527 + 7 + 7 + 98 + 7 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a self number, because there is not a number n which added to its sum of digits gives 198527779872.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 362193 + ... + 726800.

It is an arithmetic number, because the mean of its divisors is an integer number (6060251610).

Almost surely, 2^198527779872 is an apocalyptic number.

198527779872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

198527779872 is an abundant number, since it is smaller than the sum of its proper divisors (383256374688).

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

198527779872 is a wasteful number, since it uses less digits than its factorization.

198527779872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1089223 (or 1089209 counting only the distinct ones).

The product of its digits is 248935680, while the sum is 72.

The spelling of 198527779872 in words is "one hundred ninety-eight billion, five hundred twenty-seven million, seven hundred seventy-nine thousand, eight hundred seventy-two".