198251908542 has 24 divisors (see below), whose sum is σ = 435595745520. Its totient is φ = 65153208960.

The previous prime is 198251908529. The next prime is 198251908549. The reversal of 198251908542 is 245809152891.

198251908542 is a `hidden beast` number, since 1 + 9 + 8 + 2 + 5 + 1 + 90 + 8 + 542 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198251908549) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 77562067 + ... + 77564622.

It is an arithmetic number, because the mean of its divisors is an integer number (18149822730).

Almost surely, 2^198251908542 is an apocalyptic number.

198251908542 is an abundant number, since it is smaller than the sum of its proper divisors (237343836978).

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

198251908542 is a wasteful number, since it uses less digits than its factorization.

198251908542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155126768 (or 155126765 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 54.

The spelling of 198251908542 in words is "one hundred ninety-eight billion, two hundred fifty-one million, nine hundred eight thousand, five hundred forty-two".