166540640 has 96 divisors (see below), whose sum is σ = 452257344. Its totient is φ = 56770560.

The previous prime is 166540639. The next prime is 166540691. The reversal of 166540640 is 46045661.

166540640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 166540597 and 166540606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 269612 + ... + 270228.

It is an arithmetic number, because the mean of its divisors is an integer number (4711014).

Almost surely, 2^166540640 is an apocalyptic number.

166540640 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 166540640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (226128672).

166540640 is an abundant number, since it is smaller than the sum of its proper divisors (285716704).

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

166540640 is a wasteful number, since it uses less digits than its factorization.

166540640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 880 (or 872 counting only the distinct ones).

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

The square root of 166540640 is about 12905.0625724946. The cubic root of 166540640 is about 550.1824628771.

The spelling of 166540640 in words is "one hundred sixty-six million, five hundred forty thousand, six hundred forty".