5639147846721 has 9 divisors (see below), whose sum is σ = 8145446068929. Its totient is φ = 3759427148436.

The previous prime is 5639147846699. The next prime is 5639147846803. The reversal of 5639147846721 is 1276487419365.

The square root of 5639147846721 is 2374689.

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

5639147846721 is a `hidden beast` number, since 5 + 6 + 3 + 9 + 147 + 8 + 467 + 21 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 5639147846721 - 2⁷ = 5639147846593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (5639147841721) 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, 6728286 + ... + 7519848.

Almost surely, 2^{5639147846721} is an apocalyptic number.

5639147846721 is the 2374689-th square number.

5639147846721 is the 1187345-th centered octagonal number.

It is an amenable number.

5639147846721 is a deficient number, since it is larger than the sum of its proper divisors (2506298222208).

5639147846721 is an frugal number, since it uses more digits than its factorization.

5639147846721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1583132 (or 791566 counting only the distinct ones).

The product of its digits is 60963840, while the sum is 63.

The spelling of 5639147846721 in words is "five trillion, six hundred thirty-nine billion, one hundred forty-seven million, eight hundred forty-six thousand, seven hundred twenty-one".