646223243420 has 24 divisors (see below), whose sum is σ = 1365194978784. Its totient is φ = 256941455936.

The previous prime is 646223243401. The next prime is 646223243437. The reversal of 646223243420 is 24342322646.

It is a congruent number.

It is an unprimeable number.

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, 96736667 + ... + 96743346.

It is an arithmetic number, because the mean of its divisors is an integer number (56883124116).

Almost surely, 2^646223243420 is an apocalyptic number.

It is an amenable number.

646223243420 is an abundant number, since it is smaller than the sum of its proper divisors (718971735364).

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

646223243420 is a wasteful number, since it uses less digits than its factorization.

646223243420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193480189 (or 193480187 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 38.

The spelling of 646223243420 in words is "six hundred forty-six billion, two hundred twenty-three million, two hundred forty-three thousand, four hundred twenty".