166621266 has 48 divisors (see below), whose sum is σ = 430728480. Its totient is φ = 47605320.

The previous prime is 166621237. The next prime is 166621289. The reversal of 166621266 is 662126661.

It is a happy number.

166621266 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 166621266.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28840 + ... + 34131.

It is an arithmetic number, because the mean of its divisors is an integer number (8973510).

Almost surely, 2^166621266 is an apocalyptic number.

166621266 is an abundant number, since it is smaller than the sum of its proper divisors (264107214).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166621266 is a wasteful number, since it uses less digits than its factorization.

166621266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62996 (or 62983 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 166621266 is about 12908.1860073366. The cubic root of 166621266 is about 550.2712337116.

The spelling of 166621266 in words is "one hundred sixty-six million, six hundred twenty-one thousand, two hundred sixty-six".