665452117608 has 32 divisors (see below), whose sum is σ = 1668397164000. Its totient is φ = 221181789888.

The previous prime is 665452117601. The next prime is 665452117639. The reversal of 665452117608 is 806711254566.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (665452117601) 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, 39715366 + ... + 39732117.

It is an arithmetic number, because the mean of its divisors is an integer number (52137411375).

Almost surely, 2^665452117608 is an apocalyptic number.

It is an amenable number.

665452117608 is an abundant number, since it is smaller than the sum of its proper divisors (1002945046392).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665452117608 is a wasteful number, since it uses less digits than its factorization.

665452117608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79447841 (or 79447837 counting only the distinct ones).

The product of its (nonzero) digits is 2419200, while the sum is 51.

The spelling of 665452117608 in words is "six hundred sixty-five billion, four hundred fifty-two million, one hundred seventeen thousand, six hundred eight".