166082775121 has 4 divisors (see below), whose sum is σ = 166090027572. Its totient is φ = 166075522672.

The previous prime is 166082775107. The next prime is 166082775137. The reversal of 166082775121 is 121577280661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 125333700625 + 40749074496 = 354025^2 + 201864^2 .

It is a cyclic number.

It is not a de Polignac number, because 166082775121 - 2²⁷ = 165948557393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166082775191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3591766 + ... + 3637711.

It is an arithmetic number, because the mean of its divisors is an integer number (41522506893).

Almost surely, 2^166082775121 is an apocalyptic number.

It is an amenable number.

166082775121 is a deficient number, since it is larger than the sum of its proper divisors (7252451).

166082775121 is an equidigital number, since it uses as much as digits as its factorization.

166082775121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7252450.

The product of its (nonzero) digits is 282240, while the sum is 46.

The spelling of 166082775121 in words is "one hundred sixty-six billion, eighty-two million, seven hundred seventy-five thousand, one hundred twenty-one".