647789961316 has 27 divisors (see below), whose sum is σ = 1144630485817. Its totient is φ = 320782610240.

The previous prime is 647789961311. The next prime is 647789961319. The reversal of 647789961316 is 613169987746.

The square root of 647789961316 is 804854.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 288749321316 + 359040640000 = 537354^2 + 599200^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647789961311) 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 8 ways as a sum of consecutive naturals, for example, 172236876 + ... + 172240636.

Almost surely, 2^647789961316 is an apocalyptic number.

647789961316 is the 804854-th square number.

It is an amenable number.

647789961316 is a deficient number, since it is larger than the sum of its proper divisors (496840524501).

647789961316 is an frugal number, since it uses more digits than its factorization.

647789961316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7740 (or 3870 counting only the distinct ones).

The product of its digits is 82301184, while the sum is 67.

The spelling of 647789961316 in words is "six hundred forty-seven billion, seven hundred eighty-nine million, nine hundred sixty-one thousand, three hundred sixteen".