166156243 has 4 divisors (see below), whose sum is σ = 181261368. Its totient is φ = 151051120.

The previous prime is 166156229. The next prime is 166156267. The reversal of 166156243 is 342651661.

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

It is a de Polignac number, because none of the positive numbers 2^k-166156243 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166156199 and 166156208.

It is not an unprimeable number, because it can be changed into a prime (166156223) 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, 7552546 + ... + 7552567.

It is an arithmetic number, because the mean of its divisors is an integer number (45315342).

Almost surely, 2^166156243 is an apocalyptic number.

166156243 is a deficient number, since it is larger than the sum of its proper divisors (15105125).

166156243 is a wasteful number, since it uses less digits than its factorization.

166156243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15105124.

The product of its digits is 25920, while the sum is 34.

The square root of 166156243 is about 12890.1607049718. The cubic root of 166156243 is about 549.7588397277.

The spelling of 166156243 in words is "one hundred sixty-six million, one hundred fifty-six thousand, two hundred forty-three".