6501650665665 has 16 divisors (see below), whose sum is σ = 10426665650688. Its totient is φ = 3459538826496.

The previous prime is 6501650665661. The next prime is 6501650665687. The reversal of 6501650665665 is 5665660561056.

It is not a de Polignac number, because 6501650665665 - 2² = 6501650665661 is a prime.

It is a super-2 number, since 2×6501650665665² (a number of 26 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6501650665661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 500505489 + ... + 500518478.

It is an arithmetic number, because the mean of its divisors is an integer number (651666603168).

Almost surely, 2^{6501650665665} is an apocalyptic number.

It is an amenable number.

6501650665665 is a deficient number, since it is larger than the sum of its proper divisors (3925014985023).

6501650665665 is a wasteful number, since it uses less digits than its factorization.

6501650665665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1001024408.

The product of its (nonzero) digits is 29160000, while the sum is 57.

The spelling of 6501650665665 in words is "six trillion, five hundred one billion, six hundred fifty million, six hundred sixty-five thousand, six hundred sixty-five".