198818899801 has 2 divisors, whose sum is σ = 198818899802. Its totient is φ = 198818899800.

The previous prime is 198818899781. The next prime is 198818899879. The reversal of 198818899801 is 108998818891.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 143528080201 + 55290819600 = 378851^2 + 235140^2 .

It is an emirp because it is prime and its reverse (108998818891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198818899801 - 2²¹ = 198816802649 is a prime.

It is not a weakly prime, because it can be changed into another prime (198818899891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99409449900 + 99409449901.

It is an arithmetic number, because the mean of its divisors is an integer number (99409449901).

Almost surely, 2^198818899801 is an apocalyptic number.

It is an amenable number.

198818899801 is a deficient number, since it is larger than the sum of its proper divisors (1).

198818899801 is an equidigital number, since it uses as much as digits as its factorization.

198818899801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23887872, while the sum is 70.

The spelling of 198818899801 in words is "one hundred ninety-eight billion, eight hundred eighteen million, eight hundred ninety-nine thousand, eight hundred one".