668280380653 has 4 divisors (see below), whose sum is σ = 691324531740. Its totient is φ = 645236229568.

The previous prime is 668280380587. The next prime is 668280380681. The reversal of 668280380653 is 356083082866.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 146090599524 + 522189781129 = 382218^2 + 722627^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-668280380653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 668280380594 and 668280380603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668280380683) 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 3 ways as a sum of consecutive naturals, for example, 11522075500 + ... + 11522075557.

It is an arithmetic number, because the mean of its divisors is an integer number (172831132935).

Almost surely, 2^668280380653 is an apocalyptic number.

It is an amenable number.

668280380653 is a deficient number, since it is larger than the sum of its proper divisors (23044151087).

668280380653 is a wasteful number, since it uses less digits than its factorization.

668280380653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23044151086.

The product of its (nonzero) digits is 9953280, while the sum is 55.

The spelling of 668280380653 in words is "six hundred sixty-eight billion, two hundred eighty million, three hundred eighty thousand, six hundred fifty-three".