665501066611 has 16 divisors (see below), whose sum is σ = 678600281088. Its totient is φ = 652475728800.

The previous prime is 665501066569. The next prime is 665501066627. The reversal of 665501066611 is 116660105566.

It is a cyclic number.

It is not a de Polignac number, because 665501066611 - 2⁹ = 665501066099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665501066411) 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, 25834840 + ... + 25860586.

It is an arithmetic number, because the mean of its divisors is an integer number (42412517568).

Almost surely, 2^665501066611 is an apocalyptic number.

665501066611 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

665501066611 is a deficient number, since it is larger than the sum of its proper divisors (13099214477).

665501066611 is a wasteful number, since it uses less digits than its factorization.

665501066611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27162.

The product of its (nonzero) digits is 194400, while the sum is 43.

The spelling of 665501066611 in words is "six hundred sixty-five billion, five hundred one million, sixty-six thousand, six hundred eleven".