646582537536 has 112 divisors (see below), whose sum is σ = 1842711974208. Its totient is φ = 198908928000.

The previous prime is 646582537499. The next prime is 646582537577. The reversal of 646582537536 is 635735285646.

It is a self number, because there is not a number n which added to its sum of digits gives 646582537536.

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, 14081976 + ... + 14127816.

It is an arithmetic number, because the mean of its divisors is an integer number (16452785484).

Almost surely, 2^646582537536 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646582537536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (921355987104).

646582537536 is an abundant number, since it is smaller than the sum of its proper divisors (1196129436672).

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

646582537536 is a wasteful number, since it uses less digits than its factorization.

646582537536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51520 (or 51510 counting only the distinct ones).

The product of its digits is 108864000, while the sum is 60.

The spelling of 646582537536 in words is "six hundred forty-six billion, five hundred eighty-two million, five hundred thirty-seven thousand, five hundred thirty-six".