6518681838 has 12 divisors (see below), whose sum is σ = 14123810688. Its totient is φ = 2172893940.

The previous prime is 6518681821. The next prime is 6518681839. The reversal of 6518681838 is 8381868156.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6518681839) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 181074478 + ... + 181074513.

It is an arithmetic number, because the mean of its divisors is an integer number (1176984224).

Almost surely, 2^6518681838 is an apocalyptic number.

6518681838 is an abundant number, since it is smaller than the sum of its proper divisors (7605128850).

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

6518681838 is a wasteful number, since it uses less digits than its factorization.

6518681838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362148999 (or 362148996 counting only the distinct ones).

The product of its digits is 2211840, while the sum is 54.

The square root of 6518681838 is about 80738.3541942737. The cubic root of 6518681838 is about 1868.0418212479.

The spelling of 6518681838 in words is "six billion, five hundred eighteen million, six hundred eighty-one thousand, eight hundred thirty-eight".