198221538462394 has 16 divisors (see below), whose sum is σ = 305369049924648. Its totient is φ = 96431868029952.

The previous prime is 198221538462341. The next prime is 198221538462403. The reversal of 198221538462394 is 493264835122891.

It can be written as a sum of positive squares in 4 ways, for example, as 198066076224025 + 155462238369 = 14073595^2 + 394287^2 .

It is a super-2 number, since 2×198221538462394² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30092782 + ... + 36083494.

Almost surely, 2^{198221538462394} is an apocalyptic number.

198221538462394 is a deficient number, since it is larger than the sum of its proper divisors (107147511462254).

198221538462394 is a wasteful number, since it uses less digits than its factorization.

198221538462394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6437889.

The product of its digits is 179159040, while the sum is 67.

The spelling of 198221538462394 in words is "one hundred ninety-eight trillion, two hundred twenty-one billion, five hundred thirty-eight million, four hundred sixty-two thousand, three hundred ninety-four".