2170918766591 has 2 divisors, whose sum is σ = 2170918766592. Its totient is φ = 2170918766590.

The previous prime is 2170918766537. The next prime is 2170918766609. The reversal of 2170918766591 is 1956678190712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2170918766591 - 2¹⁴ = 2170918750207 is a prime.

It is a super-2 number, since 2×2170918766591² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2170918762591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1085459383295 + 1085459383296.

It is an arithmetic number, because the mean of its divisors is an integer number (1085459383296).

Almost surely, 2^{2170918766591} is an apocalyptic number.

2170918766591 is a deficient number, since it is larger than the sum of its proper divisors (1).

2170918766591 is an equidigital number, since it uses as much as digits as its factorization.

2170918766591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11430720, while the sum is 62.

The spelling of 2170918766591 in words is "two trillion, one hundred seventy billion, nine hundred eighteen million, seven hundred sixty-six thousand, five hundred ninety-one".