84194566661 has 2 divisors, whose sum is σ = 84194566662. Its totient is φ = 84194566660.

The previous prime is 84194566633. The next prime is 84194566681. The reversal of 84194566661 is 16666549148.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68209768900 + 15984797761 = 261170^2 + 126431^2 .

It is a cyclic number.

It is not a de Polignac number, because 84194566661 - 2²⁶ = 84127457797 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 84194566597 and 84194566606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84194566681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42097283330 + 42097283331.

It is an arithmetic number, because the mean of its divisors is an integer number (42097283331).

Almost surely, 2^84194566661 is an apocalyptic number.

It is an amenable number.

84194566661 is a deficient number, since it is larger than the sum of its proper divisors (1).

84194566661 is an equidigital number, since it uses as much as digits as its factorization.

84194566661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7464960, while the sum is 56.

The spelling of 84194566661 in words is "eighty-four billion, one hundred ninety-four million, five hundred sixty-six thousand, six hundred sixty-one".