6516164580681 has 16 divisors (see below), whose sum is σ = 9929989075968. Its totient is φ = 3723299331600.

The previous prime is 6516164580649. The next prime is 6516164580689. The reversal of 6516164580681 is 1860854616156.

It is not a de Polignac number, because 6516164580681 - 2⁵ = 6516164580649 is a prime.

It is a super-2 number, since 2×6516164580681² (a number of 26 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6516164580689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8944725 + ... + 9645746.

It is an arithmetic number, because the mean of its divisors is an integer number (620624317248).

Almost surely, 2^{6516164580681} is an apocalyptic number.

It is an amenable number.

6516164580681 is a deficient number, since it is larger than the sum of its proper divisors (3413824495287).

6516164580681 is a wasteful number, since it uses less digits than its factorization.

6516164580681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18607172.

The product of its (nonzero) digits is 8294400, while the sum is 57.

The spelling of 6516164580681 in words is "six trillion, five hundred sixteen billion, one hundred sixty-four million, five hundred eighty thousand, six hundred eighty-one".