660648311285 has 16 divisors (see below), whose sum is σ = 809949402480. Its totient is φ = 517160816640.

The previous prime is 660648311261. The next prime is 660648311299. The reversal of 660648311285 is 582113846066.

It can be written as a sum of positive squares in 8 ways, for example, as 144575613361 + 516072697924 = 380231^2 + 718382^2 .

It is a de Polignac number, because none of the positive numbers 2^k-660648311285 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 5552690 + ... + 5670419.

It is an arithmetic number, because the mean of its divisors is an integer number (50621837655).

Almost surely, 2^660648311285 is an apocalyptic number.

It is an amenable number.

660648311285 is a deficient number, since it is larger than the sum of its proper divisors (149301091195).

660648311285 is a wasteful number, since it uses less digits than its factorization.

660648311285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11223368.

The product of its (nonzero) digits is 1658880, while the sum is 50.

The spelling of 660648311285 in words is "six hundred sixty billion, six hundred forty-eight million, three hundred eleven thousand, two hundred eighty-five".