20101166547779 has 2 divisors, whose sum is σ = 20101166547780. Its totient is φ = 20101166547778.

The previous prime is 20101166547739. The next prime is 20101166547823. The reversal of 20101166547779 is 97774566110102.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20101166547779 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (20101166547719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10050583273889 + 10050583273890.

It is an arithmetic number, because the mean of its divisors is an integer number (10050583273890).

Almost surely, 2^{20101166547779} is an apocalyptic number.

20101166547779 is a deficient number, since it is larger than the sum of its proper divisors (1).

20101166547779 is an equidigital number, since it uses as much as digits as its factorization.

20101166547779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4445280, while the sum is 56.

The spelling of 20101166547779 in words is "twenty trillion, one hundred one billion, one hundred sixty-six million, five hundred forty-seven thousand, seven hundred seventy-nine".