133665523 has 8 divisors (see below), whose sum is σ = 138109536. Its totient is φ = 129292800.

The previous prime is 133665517. The next prime is 133665547. The reversal of 133665523 is 325566331.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 133665523 - 2⁵ = 133665491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133665593) 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 7 ways as a sum of consecutive naturals, for example, 13998 + ... + 21523.

It is an arithmetic number, because the mean of its divisors is an integer number (17263692).

Almost surely, 2^133665523 is an apocalyptic number.

133665523 is a deficient number, since it is larger than the sum of its proper divisors (4444013).

133665523 is an equidigital number, since it uses as much as digits as its factorization.

133665523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35645.

The product of its digits is 48600, while the sum is 34.

The square root of 133665523 is about 11561.3806701449. The cubic root of 133665523 is about 511.2968698648.

The spelling of 133665523 in words is "one hundred thirty-three million, six hundred sixty-five thousand, five hundred twenty-three".