166011601 has 4 divisors (see below), whose sum is σ = 189727552. Its totient is φ = 142295652.

The previous prime is 166011557. The next prime is 166011623. The reversal of 166011601 is 106110661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 106110661 = 23 ⋅4613507.

It is a cyclic number.

It is not a de Polignac number, because 166011601 - 2¹¹ = 166009553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166011301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11857965 + ... + 11857978.

It is an arithmetic number, because the mean of its divisors is an integer number (47431888).

Almost surely, 2^166011601 is an apocalyptic number.

It is an amenable number.

166011601 is a deficient number, since it is larger than the sum of its proper divisors (23715951).

166011601 is an equidigital number, since it uses as much as digits as its factorization.

166011601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23715950.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 166011601 is about 12884.5489249721. The cubic root of 166011601 is about 549.5992684273.

The spelling of 166011601 in words is "one hundred sixty-six million, eleven thousand, six hundred one".