647771243272 has 8 divisors (see below), whose sum is σ = 1214571081150. Its totient is φ = 323885621632.

The previous prime is 647771243269. The next prime is 647771243321. The reversal of 647771243272 is 272342177746.

It can be written as a sum of positive squares in only one way, i.e., 622278011716 + 25493231556 = 788846^2 + 159666^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×647771243272² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40485702697 + ... + 40485702712.

Almost surely, 2^647771243272 is an apocalyptic number.

It is an amenable number.

647771243272 is a deficient number, since it is larger than the sum of its proper divisors (566799837878).

647771243272 is a wasteful number, since it uses less digits than its factorization.

647771243272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80971405415 (or 80971405411 counting only the distinct ones).

The product of its digits is 5531904, while the sum is 52.

The spelling of 647771243272 in words is "six hundred forty-seven billion, seven hundred seventy-one million, two hundred forty-three thousand, two hundred seventy-two".