133551660 has 96 divisors (see below), whose sum is σ = 431972352. Its totient is φ = 30469120.

The previous prime is 133551647. The next prime is 133551661. The reversal of 133551660 is 66155331.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (133551661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5269 + ... + 17171.

It is an arithmetic number, because the mean of its divisors is an integer number (4499712).

Almost surely, 2^133551660 is an apocalyptic number.

133551660 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 133551660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (215986176).

133551660 is an abundant number, since it is smaller than the sum of its proper divisors (298420692).

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

133551660 is a wasteful number, since it uses less digits than its factorization.

133551660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11943 (or 11941 counting only the distinct ones).

The product of its (nonzero) digits is 8100, while the sum is 30.

The square root of 133551660 is about 11556.4553389004. The cubic root of 133551660 is about 511.1516458435.

The spelling of 133551660 in words is "one hundred thirty-three million, five hundred fifty-one thousand, six hundred sixty".