6518144981 has 16 divisors (see below), whose sum is σ = 7067415168. Its totient is φ = 5987520000.

The previous prime is 6518144977. The next prime is 6518144999. The reversal of 6518144981 is 1894418156.

6518144981 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 6518144981 - 2² = 6518144977 is a prime.

It is a super-2 number, since 2×6518144981² = 84972427986670980722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6518144881) 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, 1314056 + ... + 1319006.

It is an arithmetic number, because the mean of its divisors is an integer number (441713448).

Almost surely, 2^6518144981 is an apocalyptic number.

It is an amenable number.

6518144981 is a deficient number, since it is larger than the sum of its proper divisors (549270187).

6518144981 is a wasteful number, since it uses less digits than its factorization.

6518144981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6812.

The product of its digits is 276480, while the sum is 47.

The square root of 6518144981 is about 80735.0294543824. The cubic root of 6518144981 is about 1867.9905379320.

The spelling of 6518144981 in words is "six billion, five hundred eighteen million, one hundred forty-four thousand, nine hundred eighty-one".