66897523 has 8 divisors (see below), whose sum is σ = 83404800. Its totient is φ = 52127880.

The previous prime is 66897487. The next prime is 66897529. The reversal of 66897523 is 32579866.

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

It is not a de Polignac number, because 66897523 - 2⁹ = 66897011 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (66897529) 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 7 ways as a sum of consecutive naturals, for example, 434323 + ... + 434476.

It is an arithmetic number, because the mean of its divisors is an integer number (10425600).

Almost surely, 2^66897523 is an apocalyptic number.

66897523 is a deficient number, since it is larger than the sum of its proper divisors (16507277).

66897523 is a wasteful number, since it uses less digits than its factorization.

66897523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868817.

The product of its digits is 544320, while the sum is 46.

The square root of 66897523 is about 8179.0905973708. The cubic root of 66897523 is about 405.9476321109.

The spelling of 66897523 in words is "sixty-six million, eight hundred ninety-seven thousand, five hundred twenty-three".