1669504371797 has 2 divisors, whose sum is σ = 1669504371798. Its totient is φ = 1669504371796.

The previous prime is 1669504371697. The next prime is 1669504371803. The reversal of 1669504371797 is 7971734059661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1490777508676 + 178726863121 = 1220974^2 + 422761^2 .

It is an emirp because it is prime and its reverse (7971734059661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1669504371797 - 2¹⁰ = 1669504370773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1669504371697) 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, 834752185898 + 834752185899.

It is an arithmetic number, because the mean of its divisors is an integer number (834752185899).

Almost surely, 2^{1669504371797} is an apocalyptic number.

It is an amenable number.

1669504371797 is a deficient number, since it is larger than the sum of its proper divisors (1).

1669504371797 is an equidigital number, since it uses as much as digits as its factorization.

1669504371797 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60011280, while the sum is 65.

The spelling of 1669504371797 in words is "one trillion, six hundred sixty-nine billion, five hundred four million, three hundred seventy-one thousand, seven hundred ninety-seven".