166261226 has 4 divisors (see below), whose sum is σ = 249391842. Its totient is φ = 83130612.

The previous prime is 166261213. The next prime is 166261243. The reversal of 166261226 is 622162661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 622162661 = 12211 ⋅50951.

It can be written as a sum of positive squares in only one way, i.e., 165148201 + 1113025 = 12851^2 + 1055^2 .

It is a junction number, because it is equal to n+sod(n) for n = 166261192 and 166261201.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41565305 + ... + 41565308.

Almost surely, 2^166261226 is an apocalyptic number.

166261226 is a deficient number, since it is larger than the sum of its proper divisors (83130616).

166261226 is an equidigital number, since it uses as much as digits as its factorization.

166261226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83130615.

The product of its digits is 10368, while the sum is 32.

The square root of 166261226 is about 12894.2322764870. The cubic root of 166261226 is about 549.8746006124.

The spelling of 166261226 in words is "one hundred sixty-six million, two hundred sixty-one thousand, two hundred twenty-six".