198561061296381 has 24 divisors (see below), whose sum is σ = 307973843626944. Its totient is φ = 113462879544000.

The previous prime is 198561061296361. The next prime is 198561061296449. The reversal of 198561061296381 is 183692160165891.

It is a happy number.

It is not a de Polignac number, because 198561061296381 - 2¹⁵ = 198561061263613 is a prime.

It is a super-2 number, since 2×198561061296381² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198561061296361) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26026881 + ... + 32779881.

It is an arithmetic number, because the mean of its divisors is an integer number (12832243484456).

Almost surely, 2^{198561061296381} is an apocalyptic number.

It is an amenable number.

198561061296381 is a deficient number, since it is larger than the sum of its proper divisors (109412782330563).

198561061296381 is a wasteful number, since it uses less digits than its factorization.

198561061296381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6953041 (or 6953034 counting only the distinct ones).

The product of its (nonzero) digits is 33592320, while the sum is 66.

The spelling of 198561061296381 in words is "one hundred ninety-eight trillion, five hundred sixty-one billion, sixty-one million, two hundred ninety-six thousand, three hundred eighty-one".