6511660216165 has 32 divisors (see below), whose sum is σ = 8947353623040. Its totient is φ = 4506814792704.

The previous prime is 6511660216163. The next prime is 6511660216219. The reversal of 6511660216165 is 5616120661156.

It is not a de Polignac number, because 6511660216165 - 2¹ = 6511660216163 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6511660216163) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12064159 + ... + 12592348.

It is an arithmetic number, because the mean of its divisors is an integer number (279604800720).

Almost surely, 2^{6511660216165} is an apocalyptic number.

6511660216165 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

6511660216165 is a deficient number, since it is larger than the sum of its proper divisors (2435693406875).

6511660216165 is a wasteful number, since it uses less digits than its factorization.

6511660216165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24656781.

The product of its (nonzero) digits is 388800, while the sum is 46.

The spelling of 6511660216165 in words is "six trillion, five hundred eleven billion, six hundred sixty million, two hundred sixteen thousand, one hundred sixty-five".