665128118074 has 48 divisors (see below), whose sum is σ = 1170232617600. Its totient is φ = 282690626400.

The previous prime is 665128118041. The next prime is 665128118077. The reversal of 665128118074 is 470811821566.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (665128118077) 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 23 ways as a sum of consecutive naturals, for example, 8826484 + ... + 8901520.

It is an arithmetic number, because the mean of its divisors is an integer number (24379846200).

Almost surely, 2^665128118074 is an apocalyptic number.

665128118074 is a deficient number, since it is larger than the sum of its proper divisors (505104499526).

665128118074 is a wasteful number, since it uses less digits than its factorization.

665128118074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75803 (or 75796 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 49.

The spelling of 665128118074 in words is "six hundred sixty-five billion, one hundred twenty-eight million, one hundred eighteen thousand, seventy-four".