198863375481 has 15 divisors (see below), whose sum is σ = 297073507071. Its totient is φ = 132572908008.

The previous prime is 198863375453. The next prime is 198863375483. The reversal of 198863375481 is 184573368891.

The square root of 198863375481 is 445941.

It is a perfect power (a square), and thus also a powerful number.

198863375481 is a `hidden beast` number, since 1 + 9 + 8 + 86 + 3 + 3 + 7 + 548 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 167682879081 + 31180496400 = 409491^2 + 176580^2 .

It is not a de Polignac number, because 198863375481 - 2¹³ = 198863367289 is a prime.

It is a super-2 number, since 2×198863375481² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (198863375483) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 3988695 + ... + 4038243.

Almost surely, 2^198863375481 is an apocalyptic number.

198863375481 is the 445941-st square number.

198863375481 is the 222971-st centered octagonal number.

It is an amenable number.

198863375481 is a deficient number, since it is larger than the sum of its proper divisors (98210131590).

198863375481 is an frugal number, since it uses more digits than its factorization.

198863375481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99110 (or 49552 counting only the distinct ones).

The product of its digits is 34836480, while the sum is 63.

The spelling of 198863375481 in words is "one hundred ninety-eight billion, eight hundred sixty-three million, three hundred seventy-five thousand, four hundred eighty-one".