646124403646420 has 24 divisors (see below), whose sum is σ = 1356986200802400. Its totient is φ = 258425960859552.

The previous prime is 646124403646411. The next prime is 646124403646453. The reversal of 646124403646420 is 24646304421646.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1487314830 + ... + 1487749189.

It is an arithmetic number, because the mean of its divisors is an integer number (56541091700100).

Almost surely, 2^{646124403646420} is an apocalyptic number.

It is an amenable number.

646124403646420 is an abundant number, since it is smaller than the sum of its proper divisors (710861797155980).

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

646124403646420 is a wasteful number, since it uses less digits than its factorization.

646124403646420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2975074887 (or 2975074885 counting only the distinct ones).

The product of its (nonzero) digits is 15925248, while the sum is 52.

The spelling of 646124403646420 in words is "six hundred forty-six trillion, one hundred twenty-four billion, four hundred three million, six hundred forty-six thousand, four hundred twenty".