820117569701 has 2 divisors, whose sum is σ = 820117569702. Its totient is φ = 820117569700.

The previous prime is 820117569641. The next prime is 820117569737. The reversal of 820117569701 is 107965711028.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 741061000801 + 79056568900 = 860849^2 + 281170^2 .

It is a cyclic number.

It is not a de Polignac number, because 820117569701 - 2¹⁸ = 820117307557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (820117569301) 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, 410058784850 + 410058784851.

It is an arithmetic number, because the mean of its divisors is an integer number (410058784851).

Almost surely, 2^820117569701 is an apocalyptic number.

It is an amenable number.

820117569701 is a deficient number, since it is larger than the sum of its proper divisors (1).

820117569701 is an equidigital number, since it uses as much as digits as its factorization.

820117569701 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 211680, while the sum is 47.

The spelling of 820117569701 in words is "eight hundred twenty billion, one hundred seventeen million, five hundred sixty-nine thousand, seven hundred one".