166958659709 has 2 divisors, whose sum is σ = 166958659710. Its totient is φ = 166958659708.

The previous prime is 166958659691. The next prime is 166958659717. The reversal of 166958659709 is 907956859661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123765350809 + 43193308900 = 351803^2 + 207830^2 .

It is a cyclic number.

It is not a de Polignac number, because 166958659709 - 2⁸ = 166958659453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166958659729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83479329854 + 83479329855.

It is an arithmetic number, because the mean of its divisors is an integer number (83479329855).

Almost surely, 2^166958659709 is an apocalyptic number.

It is an amenable number.

166958659709 is a deficient number, since it is larger than the sum of its proper divisors (1).

166958659709 is an equidigital number, since it uses as much as digits as its factorization.

166958659709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 220449600, while the sum is 71.

The spelling of 166958659709 in words is "one hundred sixty-six billion, nine hundred fifty-eight million, six hundred fifty-nine thousand, seven hundred nine".