665555601544 has 16 divisors (see below), whose sum is σ = 1269067885200. Its totient is φ = 327137498832.

The previous prime is 665555601539. The next prime is 665555601583. The reversal of 665555601544 is 445106555566.

It is a junction number, because it is equal to n+sod(n) for n = 665555601491 and 665555601500.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 705037242 + ... + 705038185.

It is an arithmetic number, because the mean of its divisors is an integer number (79316742825).

Almost surely, 2^665555601544 is an apocalyptic number.

It is an amenable number.

665555601544 is a deficient number, since it is larger than the sum of its proper divisors (603512283656).

665555601544 is a wasteful number, since it uses less digits than its factorization.

665555601544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1410075492 (or 1410075488 counting only the distinct ones).

The product of its (nonzero) digits is 10800000, while the sum is 52.

The spelling of 665555601544 in words is "six hundred sixty-five billion, five hundred fifty-five million, six hundred one thousand, five hundred forty-four".