6443513540 has 12 divisors (see below), whose sum is σ = 13531378476. Its totient is φ = 2577405408.

The previous prime is 6443513537. The next prime is 6443513603. The reversal of 6443513540 is 453153446.

It can be written as a sum of positive squares in 2 ways, for example, as 2488612996 + 3954900544 = 49886^2 + 62888^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 6443513540.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161087819 + ... + 161087858.

It is an arithmetic number, because the mean of its divisors is an integer number (1127614873).

Almost surely, 2^6443513540 is an apocalyptic number.

It is an amenable number.

6443513540 is an abundant number, since it is smaller than the sum of its proper divisors (7087864936).

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

6443513540 is a wasteful number, since it uses less digits than its factorization.

6443513540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322175686 (or 322175684 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 35.

The square root of 6443513540 is about 80271.4989270787. The cubic root of 6443513540 is about 1860.8337823490.

Adding to 6443513540 its reverse (453153446), we get a palindrome (6896666986).

The spelling of 6443513540 in words is "six billion, four hundred forty-three million, five hundred thirteen thousand, five hundred forty".