198197090588641 has 4 divisors (see below), whose sum is σ = 198198568956052. Its totient is φ = 198195612221232.

The previous prime is 198197090588621. The next prime is 198197090588657. The reversal of 198197090588641 is 146885090791891.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 192402671323041 + 5794419265600 = 13870929^2 + 2407160^2 .

It is a cyclic number.

It is not a de Polignac number, because 198197090588641 - 2¹³ = 198197090580449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198197090588621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 738982590 + ... + 739250743.

It is an arithmetic number, because the mean of its divisors is an integer number (49549642239013).

Almost surely, 2^{198197090588641} is an apocalyptic number.

It is an amenable number.

198197090588641 is a deficient number, since it is larger than the sum of its proper divisors (1478367411).

198197090588641 is a wasteful number, since it uses less digits than its factorization.

198197090588641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1478367410.

The product of its (nonzero) digits is 313528320, while the sum is 76.

The spelling of 198197090588641 in words is "one hundred ninety-eight trillion, one hundred ninety-seven billion, ninety million, five hundred eighty-eight thousand, six hundred forty-one".