6421359808512 has 832 divisors, whose sum is σ = 21197102284800. Its totient is φ = 1904765829120.

The previous prime is 6421359808511. The next prime is 6421359808517. The reversal of 6421359808512 is 2158089531246.

6421359808512 is a `hidden beast` number, since 6 + 4 + 2 + 1 + 35 + 98 + 0 + 8 + 512 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6421359808511) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 13750234903 + ... + 13750235369.

It is an arithmetic number, because the mean of its divisors is an integer number (25477286400).

Almost surely, 2^{6421359808512} 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 6421359808512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10598551142400).

6421359808512 is an abundant number, since it is smaller than the sum of its proper divisors (14775742476288).

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

6421359808512 is a wasteful number, since it uses less digits than its factorization.

6421359808512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 727 (or 699 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 54.

The spelling of 6421359808512 in words is "six trillion, four hundred twenty-one billion, three hundred fifty-nine million, eight hundred eight thousand, five hundred twelve".