166656140 has 48 divisors (see below), whose sum is σ = 410797632. Its totient is φ = 55593216.

The previous prime is 166656107. The next prime is 166656143. The reversal of 166656140 is 41656661.

166656140 is digitally balanced in base 3, 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 (35).

It is a self number, because there is not a number n which added to its sum of digits gives 166656140.

It is not an unprimeable number, because it can be changed into a prime (166656143) 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, 10907 + ... + 21266.

It is an arithmetic number, because the mean of its divisors is an integer number (8558284).

Almost surely, 2^166656140 is an apocalyptic number.

166656140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166656140 is an abundant number, since it is smaller than the sum of its proper divisors (244141492).

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

166656140 is a wasteful number, since it uses less digits than its factorization.

166656140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32226 (or 32224 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 166656140 is about 12909.5367848734. The cubic root of 166656140 is about 550.3096218093.

The spelling of 166656140 in words is "one hundred sixty-six million, six hundred fifty-six thousand, one hundred forty".