646021263501240 has 256 divisors, whose sum is σ = 2118124722954240. Its totient is φ = 156324347712000.

The previous prime is 646021263501227. The next prime is 646021263501283. The reversal of 646021263501240 is 42105362120646.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 646021263501192 and 646021263501201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12233602917 + ... + 12233655723.

It is an arithmetic number, because the mean of its divisors is an integer number (8273924699040).

Almost surely, 2^{646021263501240} is an apocalyptic number.

646021263501240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646021263501240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1059062361477120).

646021263501240 is an abundant number, since it is smaller than the sum of its proper divisors (1472103459453000).

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

646021263501240 is a wasteful number, since it uses less digits than its factorization.

646021263501240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69634 (or 69630 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 42.

The spelling of 646021263501240 in words is "six hundred forty-six trillion, twenty-one billion, two hundred sixty-three million, five hundred one thousand, two hundred forty".