6443356540 has 48 divisors (see below), whose sum is σ = 13594392000. Its totient is φ = 2565312512.

The previous prime is 6443356501. The next prime is 6443356663. The reversal of 6443356540 is 456533446.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 6443356493 and 6443356502.

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, 5809506 + ... + 5810614.

It is an arithmetic number, because the mean of its divisors is an integer number (283216500).

Almost surely, 2^6443356540 is an apocalyptic number.

It is an amenable number.

6443356540 is an abundant number, since it is smaller than the sum of its proper divisors (7151035460).

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

6443356540 is a wasteful number, since it uses less digits than its factorization.

6443356540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2214 (or 2212 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 40.

The square root of 6443356540 is about 80270.5209899624. The cubic root of 6443356540 is about 1860.8186687894.

Adding to 6443356540 its reverse (456533446), we get a palindrome (6899889986).

The spelling of 6443356540 in words is "six billion, four hundred forty-three million, three hundred fifty-six thousand, five hundred forty".