646720323906048 has 80 divisors (see below), whose sum is σ = 1969032414782400. Its totient is φ = 184777235398656.

The previous prime is 646720323906047. The next prime is 646720323906091. The reversal of 646720323906048 is 840609323027646.

It is a junction number, because it is equal to n+sod(n) for n = 646720323905982 and 646720323906000.

It is not an unprimeable number, because it can be changed into a prime (646720323906047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30074409073 + ... + 30074430576.

It is an arithmetic number, because the mean of its divisors is an integer number (24612905184780).

Almost surely, 2^{646720323906048} is an apocalyptic number.

It is an amenable number.

646720323906048 is an abundant number, since it is smaller than the sum of its proper divisors (1322312090876352).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646720323906048 is an equidigital number, since it uses as much as digits as its factorization.

646720323906048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60148839677 (or 60148839661 counting only the distinct ones).

The product of its (nonzero) digits is 62705664, while the sum is 60.

The spelling of 646720323906048 in words is "six hundred forty-six trillion, seven hundred twenty billion, three hundred twenty-three million, nine hundred six thousand, forty-eight".