198021641819611 has 2 divisors, whose sum is σ = 198021641819612. Its totient is φ = 198021641819610.

The previous prime is 198021641819609. The next prime is 198021641819621. The reversal of 198021641819611 is 116918146120891.

198021641819611 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (116918146120891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198021641819611 - 2¹ = 198021641819609 is a prime.

It is a super-5 number, since 5×198021641819611⁵ (a number of 73 digits) contains 55555 as substring.

Together with 198021641819609, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (198021641819621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99010820909805 + 99010820909806.

It is an arithmetic number, because the mean of its divisors is an integer number (99010820909806).

Almost surely, 2^{198021641819611} is an apocalyptic number.

198021641819611 is a deficient number, since it is larger than the sum of its proper divisors (1).

198021641819611 is an equidigital number, since it uses as much as digits as its factorization.

198021641819611 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1492992, while the sum is 58.

The spelling of 198021641819611 in words is "one hundred ninety-eight trillion, twenty-one billion, six hundred forty-one million, eight hundred nineteen thousand, six hundred eleven".