6541687915166 has 4 divisors (see below), whose sum is σ = 9812531872752. Its totient is φ = 3270843957582.

The previous prime is 6541687915157. The next prime is 6541687915187. The reversal of 6541687915166 is 6615197861456.

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

It is a super-2 number, since 2×6541687915166² (a number of 26 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 1635421978790 + ... + 1635421978793.

It is an arithmetic number, because the mean of its divisors is an integer number (2453132968188).

Almost surely, 2^{6541687915166} is an apocalyptic number.

6541687915166 is a deficient number, since it is larger than the sum of its proper divisors (3270843957586).

6541687915166 is a wasteful number, since it uses less digits than its factorization.

6541687915166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3270843957585.

The product of its digits is 65318400, while the sum is 65.

The spelling of 6541687915166 in words is "six trillion, five hundred forty-one billion, six hundred eighty-seven million, nine hundred fifteen thousand, one hundred sixty-six".