166805943274079 has 8 divisors (see below), whose sum is σ = 172248784844928. Its totient is φ = 161366976996480.

The previous prime is 166805943274073. The next prime is 166805943274081. The reversal of 166805943274079 is 970472349508661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166805943274079 is a prime.

It is a super-2 number, since 2×166805943274079² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166805943274073) 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 7 ways as a sum of consecutive naturals, for example, 968735822 + ... + 968907995.

It is an arithmetic number, because the mean of its divisors is an integer number (21531098105616).

It is a 1-persistent number, because it is pandigital, but 2⋅166805943274079 = 333611886548158 is not.

Almost surely, 2^{166805943274079} is an apocalyptic number.

166805943274079 is a deficient number, since it is larger than the sum of its proper divisors (5442841570849).

166805943274079 is a wasteful number, since it uses less digits than its factorization.

166805943274079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1937646625.

The product of its (nonzero) digits is 548674560, while the sum is 71.

The spelling of 166805943274079 in words is "one hundred sixty-six trillion, eight hundred five billion, nine hundred forty-three million, two hundred seventy-four thousand, seventy-nine".