166156145 has 4 divisors (see below), whose sum is σ = 199387380. Its totient is φ = 132924912.

The previous prime is 166156141. The next prime is 166156153. The reversal of 166156145 is 541651661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 541651661 = 359 ⋅1508779.

It can be written as a sum of positive squares in 2 ways, for example, as 35808256 + 130347889 = 5984^2 + 11417^2 .

It is a cyclic number.

It is not a de Polignac number, because 166156145 - 2² = 166156141 is a prime.

It is a super-2 number, since 2×166156145² = 55215729042522050, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (166156141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16615610 + ... + 16615619.

It is an arithmetic number, because the mean of its divisors is an integer number (49846845).

Almost surely, 2^166156145 is an apocalyptic number.

It is an amenable number.

166156145 is a deficient number, since it is larger than the sum of its proper divisors (33231235).

166156145 is an equidigital number, since it uses as much as digits as its factorization.

166156145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33231234.

The product of its digits is 21600, while the sum is 35.

The square root of 166156145 is about 12890.1569036222. The cubic root of 166156145 is about 549.7587316439.

The spelling of 166156145 in words is "one hundred sixty-six million, one hundred fifty-six thousand, one hundred forty-five".