665357814728 has 96 divisors (see below), whose sum is σ = 1338638827680. Its totient is φ = 308948889600.

The previous prime is 665357814689. The next prime is 665357814731. The reversal of 665357814728 is 827418753566.

665357814728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1034770775 + ... + 1034771417.

It is an arithmetic number, because the mean of its divisors is an integer number (13944154455).

Almost surely, 2^665357814728 is an apocalyptic number.

665357814728 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

665357814728 is an abundant number, since it is smaller than the sum of its proper divisors (673281012952).

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

665357814728 is a wasteful number, since it uses less digits than its factorization.

665357814728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1279 (or 1034 counting only the distinct ones).

The product of its digits is 67737600, while the sum is 62.

The spelling of 665357814728 in words is "six hundred sixty-five billion, three hundred fifty-seven million, eight hundred fourteen thousand, seven hundred twenty-eight".