6540835538 has 12 divisors (see below), whose sum is σ = 10354814190. Its totient is φ = 3098290176.

The previous prime is 6540835517. The next prime is 6540835541. The reversal of 6540835538 is 8355380456.

It can be written as a sum of positive squares in only one way, i.e., 4180527649 + 2360307889 = 64657^2 + 48583^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 6540835492 and 6540835501.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4528943 + ... + 4530386.

Almost surely, 2^6540835538 is an apocalyptic number.

6540835538 is a deficient number, since it is larger than the sum of its proper divisors (3813978652).

6540835538 is a wasteful number, since it uses less digits than its factorization.

6540835538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9059369 (or 9059350 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 47.

The square root of 6540835538 is about 80875.4322275931. The cubic root of 6540835538 is about 1870.1556046939.

The spelling of 6540835538 in words is "six billion, five hundred forty million, eight hundred thirty-five thousand, five hundred thirty-eight".