166625640 has 256 divisors, whose sum is σ = 587865600. Its totient is φ = 41932800.

The previous prime is 166625633. The next prime is 166625663. The reversal of 166625640 is 46526661.

It is a happy number.

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 = 166625595 and 166625604.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2346805 + ... + 2346875.

It is an arithmetic number, because the mean of its divisors is an integer number (2296350).

Almost surely, 2^166625640 is an apocalyptic number.

166625640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166625640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (293932800).

166625640 is an abundant number, since it is smaller than the sum of its proper divisors (421239960).

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

166625640 is a wasteful number, since it uses less digits than its factorization.

166625640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185 (or 175 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 166625640 is about 12908.3554335942. The cubic root of 166625640 is about 550.2760487539.

The spelling of 166625640 in words is "one hundred sixty-six million, six hundred twenty-five thousand, six hundred forty".