133171660 has 48 divisors (see below), whose sum is σ = 289981440. Its totient is φ = 51318720.

The previous prime is 133171657. The next prime is 133171663. The reversal of 133171660 is 66171331.

It is an interprime number because it is at equal distance from previous prime (133171657) and next prime (133171663).

It is not an unprimeable number, because it can be changed into a prime (133171663) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 214831 + ... + 215449.

It is an arithmetic number, because the mean of its divisors is an integer number (6041280).

Almost surely, 2^133171660 is an apocalyptic number.

133171660 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 133171660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144990720).

133171660 is an abundant number, since it is smaller than the sum of its proper divisors (156809780).

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

133171660 is a wasteful number, since it uses less digits than its factorization.

133171660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1006 (or 1004 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 133171660 is about 11540.0025996531. The cubic root of 133171660 is about 510.6663850806. Note that the first 3 decimals are identical.

The spelling of 133171660 in words is "one hundred thirty-three million, one hundred seventy-one thousand, six hundred sixty".