6421115624 has 96 divisors (see below), whose sum is σ = 15488496000. Its totient is φ = 2467342080.

The previous prime is 6421115599. The next prime is 6421115639. The reversal of 6421115624 is 4265111246.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 304577 + ... + 324975.

It is an arithmetic number, because the mean of its divisors is an integer number (161338500).

Almost surely, 2^6421115624 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 6421115624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7744248000).

6421115624 is an abundant number, since it is smaller than the sum of its proper divisors (9067380376).

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

6421115624 is a wasteful number, since it uses less digits than its factorization.

6421115624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20503 (or 20492 counting only the distinct ones).

The product of its digits is 11520, while the sum is 32.

The square root of 6421115624 is about 80131.8639743267. The cubic root of 6421115624 is about 1858.6751678826.

The spelling of 6421115624 in words is "six billion, four hundred twenty-one million, one hundred fifteen thousand, six hundred twenty-four".