6518138709 has 16 divisors (see below), whose sum is σ = 8985774080. Its totient is φ = 4198420080.

The previous prime is 6518138701. The next prime is 6518138717. The reversal of 6518138709 is 9078318156.

It is an interprime number because it is at equal distance from previous prime (6518138701) and next prime (6518138717).

It is not a de Polignac number, because 6518138709 - 2³ = 6518138701 is a prime.

It is a super-2 number, since 2×6518138709² = 84972264459528373362, 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 15 ways as a sum of consecutive naturals, for example, 954 + ... + 114180.

It is an arithmetic number, because the mean of its divisors is an integer number (561610880).

Almost surely, 2^6518138709 is an apocalyptic number.

It is an amenable number.

6518138709 is a deficient number, since it is larger than the sum of its proper divisors (2467635371).

6518138709 is a wasteful number, since it uses less digits than its factorization.

6518138709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113880.

The product of its (nonzero) digits is 362880, while the sum is 48.

The square root of 6518138709 is about 80734.9906112585. The cubic root of 6518138709 is about 1867.9899387819.

The spelling of 6518138709 in words is "six billion, five hundred eighteen million, one hundred thirty-eight thousand, seven hundred nine".