66907223423 has 4 divisors (see below), whose sum is σ = 66925016928. Its totient is φ = 66889429920.

The previous prime is 66907223417. The next prime is 66907223507. The reversal of 66907223423 is 32432270966.

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 66907223423 - 2⁶ = 66907223359 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 (66907229423) 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, 8891111 + ... + 8898632.

It is an arithmetic number, because the mean of its divisors is an integer number (16731254232).

Almost surely, 2^66907223423 is an apocalyptic number.

66907223423 is a deficient number, since it is larger than the sum of its proper divisors (17793505).

66907223423 is a wasteful number, since it uses less digits than its factorization.

66907223423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17793504.

The product of its (nonzero) digits is 653184, while the sum is 44.

The spelling of 66907223423 in words is "sixty-six billion, nine hundred seven million, two hundred twenty-three thousand, four hundred twenty-three".