166252001 has 4 divisors (see below), whose sum is σ = 166446852. Its totient is φ = 166057152.

The previous prime is 166251997. The next prime is 166252003. The reversal of 166252001 is 100252661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 100252661 = 163 ⋅615047.

It can be written as a sum of positive squares in 2 ways, for example, as 142826401 + 23425600 = 11951^2 + 4840^2 .

It is a cyclic number.

It is not a de Polignac number, because 166252001 - 2² = 166251997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166252003) 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, 96140 + ... + 97853.

It is an arithmetic number, because the mean of its divisors is an integer number (41611713).

Almost surely, 2^166252001 is an apocalyptic number.

It is an amenable number.

166252001 is a deficient number, since it is larger than the sum of its proper divisors (194851).

166252001 is an equidigital number, since it uses as much as digits as its factorization.

166252001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194850.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 166252001 is about 12893.8745534459. The cubic root of 166252001 is about 549.8644304981.

The spelling of 166252001 in words is "one hundred sixty-six million, two hundred fifty-two thousand, one".