84198661801 has 2 divisors, whose sum is σ = 84198661802. Its totient is φ = 84198661800.

The previous prime is 84198661793. The next prime is 84198661849. The reversal of 84198661801 is 10816689148.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43295621776 + 40903040025 = 208076^2 + 202245^2 .

It is a cyclic number.

It is not a de Polignac number, because 84198661801 - 2³ = 84198661793 is a prime.

It is not a weakly prime, because it can be changed into another prime (84198661201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42099330900 + 42099330901.

It is an arithmetic number, because the mean of its divisors is an integer number (42099330901).

Almost surely, 2^84198661801 is an apocalyptic number.

It is an amenable number.

84198661801 is a deficient number, since it is larger than the sum of its proper divisors (1).

84198661801 is an equidigital number, since it uses as much as digits as its factorization.

84198661801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 663552, while the sum is 52.

The spelling of 84198661801 in words is "eighty-four billion, one hundred ninety-eight million, six hundred sixty-one thousand, eight hundred one".