166604540 has 48 divisors (see below), whose sum is σ = 380190720. Its totient is φ = 61093440.

The previous prime is 166604533. The next prime is 166604549. The reversal of 166604540 is 45406661.

It is a super-2 number, since 2×166604540² = 55514145497223200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 166604497 and 166604506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166604549) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4709 + ... + 18851.

It is an arithmetic number, because the mean of its divisors is an integer number (7920640).

Almost surely, 2^166604540 is an apocalyptic number.

166604540 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 166604540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (190095360).

166604540 is an abundant number, since it is smaller than the sum of its proper divisors (213586180).

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

166604540 is a wasteful number, since it uses less digits than its factorization.

166604540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14202 (or 14200 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 166604540 is about 12907.5381076331. The cubic root of 166604540 is about 550.2528204065.

The spelling of 166604540 in words is "one hundred sixty-six million, six hundred four thousand, five hundred forty".