664822438853 has 4 divisors (see below), whose sum is σ = 677366258508. Its totient is φ = 652278619200.

The previous prime is 664822438843. The next prime is 664822438871. The reversal of 664822438853 is 358834228466.

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 534935720449 + 129886718404 = 731393^2 + 360398^2 .

It is a cyclic number.

It is not a de Polignac number, because 664822438853 - 2¹⁴ = 664822422469 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 664822438792 and 664822438801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664822438843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6271909748 + ... + 6271909853.

It is an arithmetic number, because the mean of its divisors is an integer number (169341564627).

Almost surely, 2^664822438853 is an apocalyptic number.

It is an amenable number.

664822438853 is a deficient number, since it is larger than the sum of its proper divisors (12543819655).

664822438853 is a wasteful number, since it uses less digits than its factorization.

664822438853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12543819654.

The product of its digits is 53084160, while the sum is 59.

The spelling of 664822438853 in words is "six hundred sixty-four billion, eight hundred twenty-two million, four hundred thirty-eight thousand, eight hundred fifty-three".