133665660 has 48 divisors (see below), whose sum is σ = 415850400. Its totient is φ = 35644032.

The previous prime is 133665659. The next prime is 133665661. The reversal of 133665660 is 66566331.

It is a happy number.

133665660 is a `hidden beast` number, since 1 + 33 + 66 + 566 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (133665659) and next prime (133665661).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133665661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 123225 + ... + 124304.

It is an arithmetic number, because the mean of its divisors is an integer number (8663550).

Almost surely, 2^133665660 is an apocalyptic number.

133665660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133665660 is an abundant number, since it is smaller than the sum of its proper divisors (282184740).

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

133665660 is a wasteful number, since it uses less digits than its factorization.

133665660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247547 (or 247539 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 36.

The square root of 133665660 is about 11561.3865950413. The cubic root of 133665660 is about 511.2970445487.

The spelling of 133665660 in words is "one hundred thirty-three million, six hundred sixty-five thousand, six hundred sixty".