646396127999 has 32 divisors (see below), whose sum is σ = 705406496256. Its totient is φ = 589931596800.

The previous prime is 646396127983. The next prime is 646396128013. The reversal of 646396127999 is 999721693646.

646396127999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 646396127999 - 2⁴ = 646396127983 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 (646396127929) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 114383324 + ... + 114388974.

It is an arithmetic number, because the mean of its divisors is an integer number (22043953008).

Almost surely, 2^646396127999 is an apocalyptic number.

646396127999 is a deficient number, since it is larger than the sum of its proper divisors (59010368257).

646396127999 is a wasteful number, since it uses less digits than its factorization.

646396127999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6815.

The product of its digits is 238085568, while the sum is 71.

The spelling of 646396127999 in words is "six hundred forty-six billion, three hundred ninety-six million, one hundred twenty-seven thousand, nine hundred ninety-nine".