644323462046 has 32 divisors (see below), whose sum is σ = 1065458808288. Its totient is φ = 289789194240.

The previous prime is 644323462039. The next prime is 644323462099. The reversal of 644323462046 is 640264323446.

644323462046 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×644323462046² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 644323461988 and 644323462006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10068326 + ... + 10132118.

It is an arithmetic number, because the mean of its divisors is an integer number (33295587759).

Almost surely, 2^644323462046 is an apocalyptic number.

644323462046 is a deficient number, since it is larger than the sum of its proper divisors (421135346242).

644323462046 is a wasteful number, since it uses less digits than its factorization.

644323462046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68636.

The product of its (nonzero) digits is 1990656, while the sum is 44.

The spelling of 644323462046 in words is "six hundred forty-four billion, three hundred twenty-three million, four hundred sixty-two thousand, forty-six".