6517421680 has 320 divisors, whose sum is σ = 19906725888. Its totient is φ = 1924116480.

The previous prime is 6517421621. The next prime is 6517421693. The reversal of 6517421680 is 861247156.

It is a Harshad number since it is a multiple of its sum of digits (40).

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, 22243614 + ... + 22243906.

Almost surely, 2^6517421680 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 6517421680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9953362944).

6517421680 is an abundant number, since it is smaller than the sum of its proper divisors (13389304208).

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

6517421680 is a wasteful number, since it uses less digits than its factorization.

6517421680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504 (or 498 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 6517421680 is about 80730.5498556773. The cubic root of 6517421680 is about 1867.9214400824.

The spelling of 6517421680 in words is "six billion, five hundred seventeen million, four hundred twenty-one thousand, six hundred eighty".