6435443903616 has 640 divisors, whose sum is σ = 23594270515200. Its totient is φ = 1695614902272.

The previous prime is 6435443903599. The next prime is 6435443903621. The reversal of 6435443903616 is 6163093445346.

6435443903616 is a `hidden beast` number, since 6 + 4 + 3 + 544 + 3 + 90 + 3 + 6 + 1 + 6 = 666.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1206718486 + ... + 1206723818.

It is an arithmetic number, because the mean of its divisors is an integer number (36866047680).

Almost surely, 2^{6435443903616} 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 6435443903616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11797135257600).

6435443903616 is an abundant number, since it is smaller than the sum of its proper divisors (17158826611584).

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

6435443903616 is a wasteful number, since it uses less digits than its factorization.

6435443903616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6658 (or 6637 counting only the distinct ones).

The product of its (nonzero) digits is 16796160, while the sum is 54.

The spelling of 6435443903616 in words is "six trillion, four hundred thirty-five billion, four hundred forty-three million, nine hundred three thousand, six hundred sixteen".