646214457789 has 20 divisors (see below), whose sum is σ = 965374880800. Its totient is φ = 430790817960.

The previous prime is 646214457661. The next prime is 646214457817. The reversal of 646214457789 is 987754412646.

646214457789 is a `hidden beast` number, since 6 + 46 + 2 + 1 + 445 + 77 + 89 = 666.

It is not a de Polignac number, because 646214457789 - 2⁷ = 646214457661 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646214452789) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1833162 + ... + 2157060.

It is an arithmetic number, because the mean of its divisors is an integer number (48268744040).

Almost surely, 2^646214457789 is an apocalyptic number.

It is an amenable number.

646214457789 is a deficient number, since it is larger than the sum of its proper divisors (319160423011).

646214457789 is a wasteful number, since it uses less digits than its factorization.

646214457789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348542 (or 348533 counting only the distinct ones).

The product of its digits is 81285120, while the sum is 63.

The spelling of 646214457789 in words is "six hundred forty-six billion, two hundred fourteen million, four hundred fifty-seven thousand, seven hundred eighty-nine".