2170918766609 has 2 divisors, whose sum is σ = 2170918766610. Its totient is φ = 2170918766608.

The previous prime is 2170918766591. The next prime is 2170918766629. The reversal of 2170918766609 is 9066678190712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2167534785025 + 3383981584 = 1472255^2 + 58172^2 .

It is a cyclic number.

It is not a de Polignac number, because 2170918766609 - 2⁸ = 2170918766353 is a prime.

It is not a weakly prime, because it can be changed into another prime (2170918766629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1085459383304 + 1085459383305.

It is an arithmetic number, because the mean of its divisors is an integer number (1085459383305).

Almost surely, 2^{2170918766609} is an apocalyptic number.

It is an amenable number.

2170918766609 is a deficient number, since it is larger than the sum of its proper divisors (1).

2170918766609 is an equidigital number, since it uses as much as digits as its factorization.

2170918766609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13716864, while the sum is 62.

The spelling of 2170918766609 in words is "two trillion, one hundred seventy billion, nine hundred eighteen million, seven hundred sixty-six thousand, six hundred nine".