166225644 has 72 divisors (see below), whose sum is σ = 463593312. Its totient is φ = 49893120.

The previous prime is 166225537. The next prime is 166225667. The reversal of 166225644 is 446522661.

166225644 is a `hidden beast` number, since 1 + 6 + 6 + 2 + 2 + 5 + 644 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 166225599 and 166225608.

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, 14857 + ... + 23519.

It is an arithmetic number, because the mean of its divisors is an integer number (6438796).

Almost surely, 2^166225644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166225644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (231796656).

166225644 is an abundant number, since it is smaller than the sum of its proper divisors (297367668).

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

166225644 is a wasteful number, since it uses less digits than its factorization.

166225644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8727 (or 8722 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The square root of 166225644 is about 12892.8524384637. The cubic root of 166225644 is about 549.8353711130.

The spelling of 166225644 in words is "one hundred sixty-six million, two hundred twenty-five thousand, six hundred forty-four".