5617256721 has 8 divisors (see below), whose sum is σ = 7490193984. Its totient is φ = 3744578640.

The previous prime is 5617256693. The next prime is 5617256731. The reversal of 5617256721 is 1276527165.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 5617256721 - 2¹⁰ = 5617255697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (5617256731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6810 + ... + 106211.

It is an arithmetic number, because the mean of its divisors is an integer number (936274248).

Almost surely, 2^5617256721 is an apocalyptic number.

It is an amenable number.

5617256721 is a deficient number, since it is larger than the sum of its proper divisors (1872937263).

5617256721 is a wasteful number, since it uses less digits than its factorization.

5617256721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129591.

The product of its digits is 176400, while the sum is 42.

The square root of 5617256721 is about 74948.3603623188. The cubic root of 5617256721 is about 1777.6302177306.

The spelling of 5617256721 in words is "five billion, six hundred seventeen million, two hundred fifty-six thousand, seven hundred twenty-one".