166517437273741 has 2 divisors, whose sum is σ = 166517437273742. Its totient is φ = 166517437273740.

The previous prime is 166517437273739. The next prime is 166517437273751. The reversal of 166517437273741 is 147372734715661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165396318422500 + 1121118851241 = 12860650^2 + 1058829^2 .

It is a cyclic number.

It is not a de Polignac number, because 166517437273741 - 2¹ = 166517437273739 is a prime.

Together with 166517437273739, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166517437273721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83258718636870 + 83258718636871.

It is an arithmetic number, because the mean of its divisors is an integer number (83258718636871).

Almost surely, 2^{166517437273741} is an apocalyptic number.

It is an amenable number.

166517437273741 is a deficient number, since it is larger than the sum of its proper divisors (1).

166517437273741 is an equidigital number, since it uses as much as digits as its factorization.

166517437273741 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124467840, while the sum is 64.

The spelling of 166517437273741 in words is "one hundred sixty-six trillion, five hundred seventeen billion, four hundred thirty-seven million, two hundred seventy-three thousand, seven hundred forty-one".