6518138708 has 24 divisors (see below), whose sum is σ = 12713400000. Its totient is φ = 2905918848.

The previous prime is 6518138701. The next prime is 6518138717. The reversal of 6518138708 is 8078318156.

It is a happy number.

It is a super-2 number, since 2×6518138708² = 84972264433455818528, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6518138701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2521208 + ... + 2523791.

It is an arithmetic number, because the mean of its divisors is an integer number (529725000).

Almost surely, 2^6518138708 is an apocalyptic number.

6518138708 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

6518138708 is a deficient number, since it is larger than the sum of its proper divisors (6195261292).

6518138708 is a wasteful number, since it uses less digits than its factorization.

6518138708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5045039 (or 5045037 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 47.

The square root of 6518138708 is about 80734.9906050654. The cubic root of 6518138708 is about 1867.9899386864.

The spelling of 6518138708 in words is "six billion, five hundred eighteen million, one hundred thirty-eight thousand, seven hundred eight".