166841780251775 has 12 divisors (see below), whose sum is σ = 206897671394232. Its totient is φ = 133464479761440.

The previous prime is 166841780251771. The next prime is 166841780251781. The reversal of 166841780251775 is 577152087148661.

It is not a de Polignac number, because 166841780251775 - 2² = 166841780251771 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166841780251771) 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 in 11 ways as a sum of consecutive naturals, for example, 223230464 + ... + 223976613.

It is an arithmetic number, because the mean of its divisors is an integer number (17241472616186).

Almost surely, 2^{166841780251775} is an apocalyptic number.

166841780251775 is a deficient number, since it is larger than the sum of its proper divisors (40055891142457).

166841780251775 is a wasteful number, since it uses less digits than its factorization.

166841780251775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447222010 (or 447222005 counting only the distinct ones).

The product of its (nonzero) digits is 158054400, while the sum is 68.

The spelling of 166841780251775 in words is "one hundred sixty-six trillion, eight hundred forty-one billion, seven hundred eighty million, two hundred fifty-one thousand, seven hundred seventy-five".