665500000001 has 8 divisors (see below), whose sum is σ = 667718325120. Its totient is φ = 663282003888.

The previous prime is 665499999977. The next prime is 665500000037. The reversal of 665500000001 is 100000005566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665500000001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665500000091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4370195 + ... + 4519911.

It is an arithmetic number, because the mean of its divisors is an integer number (83464790640).

Almost surely, 2^665500000001 is an apocalyptic number.

It is an amenable number.

665500000001 is a deficient number, since it is larger than the sum of its proper divisors (2218325119).

665500000001 is a wasteful number, since it uses less digits than its factorization.

665500000001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164503.

The product of its (nonzero) digits is 900, while the sum is 23.

Adding to 665500000001 its reverse (100000005566), we get a palindrome (765500005567).

The spelling of 665500000001 in words is "six hundred sixty-five billion, five hundred million, one", and thus it is an aban number.