66670423 has 4 divisors (see below), whose sum is σ = 67079608. Its totient is φ = 66261240.

The previous prime is 66670421. The next prime is 66670441. The reversal of 66670423 is 32407666.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66670423 - 2¹ = 66670421 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 (66670421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204348 + ... + 204673.

It is an arithmetic number, because the mean of its divisors is an integer number (16769902).

Almost surely, 2^66670423 is an apocalyptic number.

66670423 is a deficient number, since it is larger than the sum of its proper divisors (409185).

66670423 is a wasteful number, since it uses less digits than its factorization.

66670423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409184.

The product of its (nonzero) digits is 36288, while the sum is 34.

The square root of 66670423 is about 8165.1958335364. The cubic root of 66670423 is about 405.4877484879.

The spelling of 66670423 in words is "sixty-six million, six hundred seventy thousand, four hundred twenty-three".