2166716701697 has 2 divisors, whose sum is σ = 2166716701698. Its totient is φ = 2166716701696.

The previous prime is 2166716701651. The next prime is 2166716701703. The reversal of 2166716701697 is 7961076176612.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2110581350656 + 56135351041 = 1452784^2 + 236929^2 .

It is a cyclic number.

It is not a de Polignac number, because 2166716701697 - 2³⁰ = 2165642959873 is a prime.

It is a super-2 number, since 2×2166716701697² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2166716701997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1083358350848 + 1083358350849.

It is an arithmetic number, because the mean of its divisors is an integer number (1083358350849).

Almost surely, 2^{2166716701697} is an apocalyptic number.

It is an amenable number.

2166716701697 is a deficient number, since it is larger than the sum of its proper divisors (1).

2166716701697 is an equidigital number, since it uses as much as digits as its factorization.

2166716701697 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8001504, while the sum is 59.

The spelling of 2166716701697 in words is "two trillion, one hundred sixty-six billion, seven hundred sixteen million, seven hundred one thousand, six hundred ninety-seven".