2117994695497 has 2 divisors, whose sum is σ = 2117994695498. Its totient is φ = 2117994695496.

The previous prime is 2117994695477. The next prime is 2117994695521. The reversal of 2117994695497 is 7945964997112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1389354906681 + 728639788816 = 1178709^2 + 853604^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2117994695497 is a prime.

It is not a weakly prime, because it can be changed into another prime (2117994695477) 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, 1058997347748 + 1058997347749.

It is an arithmetic number, because the mean of its divisors is an integer number (1058997347749).

Almost surely, 2^{2117994695497} is an apocalyptic number.

It is an amenable number.

2117994695497 is a deficient number, since it is larger than the sum of its proper divisors (1).

2117994695497 is an equidigital number, since it uses as much as digits as its factorization.

2117994695497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 308629440, while the sum is 73.

The spelling of 2117994695497 in words is "two trillion, one hundred seventeen billion, nine hundred ninety-four million, six hundred ninety-five thousand, four hundred ninety-seven".