647677286656 has 81 divisors (see below), whose sum is σ = 1304730527233. Its totient is φ = 320883476480.

The previous prime is 647677286653. The next prime is 647677286677. The reversal of 647677286656 is 656682776746.

The square root of 647677286656 is 804784.

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., 437693389056 + 209983897600 = 661584^2 + 458240^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647677286653) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2304901236 + ... + 2304901516.

Almost surely, 2^647677286656 is an apocalyptic number.

647677286656 is the 804784-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 647677286656

647677286656 is an abundant number, since it is smaller than the sum of its proper divisors (657053240577).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

647677286656 is an frugal number, since it uses more digits than its factorization.

647677286656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 936 (or 462 counting only the distinct ones).

The product of its digits is 853493760, while the sum is 70.

The spelling of 647677286656 in words is "six hundred forty-seven billion, six hundred seventy-seven million, two hundred eighty-six thousand, six hundred fifty-six".