6509681018 has 4 divisors (see below), whose sum is σ = 9764521530. Its totient is φ = 3254840508.

The previous prime is 6509680999. The next prime is 6509681051. The reversal of 6509681018 is 8101869056.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 6467858929 + 41822089 = 80423^2 + 6467^2 .

It is a super-2 number, since 2×6509681018² = 84751893912219032648, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6509681018.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1627420253 + ... + 1627420256.

Almost surely, 2^6509681018 is an apocalyptic number.

6509681018 is a deficient number, since it is larger than the sum of its proper divisors (3254840512).

6509681018 is a wasteful number, since it uses less digits than its factorization.

6509681018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3254840511.

The product of its (nonzero) digits is 103680, while the sum is 44.

The square root of 6509681018 is about 80682.5942691483. The cubic root of 6509681018 is about 1867.1816446419.

The spelling of 6509681018 in words is "six billion, five hundred nine million, six hundred eighty-one thousand, eighteen".