166785776341 has 2 divisors, whose sum is σ = 166785776342. Its totient is φ = 166785776340.

The previous prime is 166785776291. The next prime is 166785776363. The reversal of 166785776341 is 143677587661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 162835653841 + 3950122500 = 403529^2 + 62850^2 .

It is a cyclic number.

It is not a de Polignac number, because 166785776341 - 2⁹ = 166785775829 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166785776341.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166785776141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83392888170 + 83392888171.

It is an arithmetic number, because the mean of its divisors is an integer number (83392888171).

Almost surely, 2^166785776341 is an apocalyptic number.

It is an amenable number.

166785776341 is a deficient number, since it is larger than the sum of its proper divisors (1).

166785776341 is an equidigital number, since it uses as much as digits as its factorization.

166785776341 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35562240, while the sum is 61.

The spelling of 166785776341 in words is "one hundred sixty-six billion, seven hundred eighty-five million, seven hundred seventy-six thousand, three hundred forty-one".