198978291122 has 54 divisors (see below), whose sum is σ = 341365272183. Its totient is φ = 86934523104.

The previous prime is 198978291119. The next prime is 198978291157. The reversal of 198978291122 is 221192879891.

It can be written as a sum of positive squares in 5 ways, for example, as 55140902041 + 143837389081 = 234821^2 + 379259^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=315419.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 155816348 + ... + 155817624.

Almost surely, 2^198978291122 is an apocalyptic number.

198978291122 is a deficient number, since it is larger than the sum of its proper divisors (142386981061).

198978291122 is an equidigital number, since it uses as much as digits as its factorization.

198978291122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2620 (or 1311 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 59.

The spelling of 198978291122 in words is "one hundred ninety-eight billion, nine hundred seventy-eight million, two hundred ninety-one thousand, one hundred twenty-two".