660155705648 has 20 divisors (see below), whose sum is σ = 1279083131208. Its totient is φ = 330069736320.

The previous prime is 660155705647. The next prime is 660155705659. The reversal of 660155705648 is 846507551066.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 660155705648.

It is not an unprimeable number, because it can be changed into a prime (660155705647) by changing a digit.

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, 193028 + ... + 1165148.

Almost surely, 2^660155705648 is an apocalyptic number.

It is an amenable number.

660155705648 is a deficient number, since it is larger than the sum of its proper divisors (618927425560).

660155705648 is a wasteful number, since it uses less digits than its factorization.

660155705648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1014572 (or 1014566 counting only the distinct ones).

The product of its (nonzero) digits is 6048000, while the sum is 53.

The spelling of 660155705648 in words is "six hundred sixty billion, one hundred fifty-five million, seven hundred five thousand, six hundred forty-eight".