647244770660 has 24 divisors (see below), whose sum is σ = 1359302580216. Its totient is φ = 258881039360.

The previous prime is 647244770647. The next prime is 647244770723. The reversal of 647244770660 is 66077442746.

It can be written as a sum of positive squares in 4 ways, for example, as 77714943076 + 569529827584 = 278774^2 + 754672^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 737357 + ... + 1355796.

It is an arithmetic number, because the mean of its divisors is an integer number (56637607509).

Almost surely, 2^647244770660 is an apocalyptic number.

It is an amenable number.

647244770660 is an abundant number, since it is smaller than the sum of its proper divisors (712057809556).

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

647244770660 is a wasteful number, since it uses less digits than its factorization.

647244770660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2108623 (or 2108621 counting only the distinct ones).

The product of its (nonzero) digits is 9483264, while the sum is 53.

It can be divided in two parts, 64724 and 4770660, that added together give a palindrome (4835384).

The spelling of 647244770660 in words is "six hundred forty-seven billion, two hundred forty-four million, seven hundred seventy thousand, six hundred sixty".