166122540 has 72 divisors (see below), whose sum is σ = 508588080. Its totient is φ = 43887744.

The previous prime is 166122497. The next prime is 166122557. The reversal of 166122540 is 45221661.

166122540 is a `hidden beast` number, since 1 + 6 + 612 + 2 + 5 + 40 = 666.

166122540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 15387 + ... + 23853.

Almost surely, 2^166122540 is an apocalyptic number.

166122540 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 166122540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (254294040).

166122540 is an abundant number, since it is smaller than the sum of its proper divisors (342465540).

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

166122540 is a wasteful number, since it uses less digits than its factorization.

166122540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8591 (or 8586 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 166122540 is about 12888.8533237057. The cubic root of 166122540 is about 549.7216663324.

The spelling of 166122540 in words is "one hundred sixty-six million, one hundred twenty-two thousand, five hundred forty".