66623523 has 8 divisors (see below), whose sum is σ = 90048528. Its totient is φ = 43807104.

The previous prime is 66623521. The next prime is 66623533. The reversal of 66623523 is 32532666.

66623523 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 66623523 - 2¹ = 66623521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66623521) 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 7 ways as a sum of consecutive naturals, for example, 151890 + ... + 152327.

It is an arithmetic number, because the mean of its divisors is an integer number (11256066).

Almost surely, 2^66623523 is an apocalyptic number.

66623523 is a deficient number, since it is larger than the sum of its proper divisors (23425005).

66623523 is a wasteful number, since it uses less digits than its factorization.

66623523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304293.

The product of its digits is 38880, while the sum is 33.

The square root of 66623523 is about 8162.3233824690. The cubic root of 66623523 is about 405.3926446642.

The spelling of 66623523 in words is "sixty-six million, six hundred twenty-three thousand, five hundred twenty-three".