66642423 has 8 divisors (see below), whose sum is σ = 89185536. Its totient is φ = 44263800.

The previous prime is 66642419. The next prime is 66642437. The reversal of 66642423 is 32424666.

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

It is not a de Polignac number, because 66642423 - 2² = 66642419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66642473) 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, 40173 + ... + 41798.

It is an arithmetic number, because the mean of its divisors is an integer number (11148192).

Almost surely, 2^66642423 is an apocalyptic number.

66642423 is a deficient number, since it is larger than the sum of its proper divisors (22543113).

66642423 is a wasteful number, since it uses less digits than its factorization.

66642423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82245.

The product of its digits is 41472, while the sum is 33.

The square root of 66642423 is about 8163.4810589601. The cubic root of 66642423 is about 405.4309754530.

The spelling of 66642423 in words is "sixty-six million, six hundred forty-two thousand, four hundred twenty-three".