66756423 has 8 divisors (see below), whose sum is σ = 91879936. Its totient is φ = 43068600.

The previous prime is 66756397. The next prime is 66756451. The reversal of 66756423 is 32465766.

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

It is not a de Polignac number, because 66756423 - 2⁶ = 66756359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66756493) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 358813 + ... + 358998.

It is an arithmetic number, because the mean of its divisors is an integer number (11484992).

Almost surely, 2^66756423 is an apocalyptic number.

66756423 is a deficient number, since it is larger than the sum of its proper divisors (25123513).

66756423 is a wasteful number, since it uses less digits than its factorization.

66756423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 717845.

The product of its digits is 181440, while the sum is 39.

The square root of 66756423 is about 8170.4603909449. The cubic root of 66756423 is about 405.6620234834.

The spelling of 66756423 in words is "sixty-six million, seven hundred fifty-six thousand, four hundred twenty-three".