646605423 has 10 divisors (see below), whose sum is σ = 965916864. Its totient is φ = 431070228.

The previous prime is 646605361. The next prime is 646605439. The reversal of 646605423 is 324506646.

646605423 is a `hidden beast` number, since 6 + 4 + 6 + 605 + 42 + 3 = 666.

It is not a de Polignac number, because 646605423 - 2¹² = 646601327 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646605623) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3991311 + ... + 3991472.

Almost surely, 2^646605423 is an apocalyptic number.

646605423 is a deficient number, since it is larger than the sum of its proper divisors (319311441).

646605423 is an equidigital number, since it uses as much as digits as its factorization.

646605423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7982795 (or 7982786 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

The square root of 646605423 is about 25428.4372897746. The cubic root of 646605423 is about 864.7285160477.

The spelling of 646605423 in words is "six hundred forty-six million, six hundred five thousand, four hundred twenty-three".