5500725721 has 2 divisors, whose sum is σ = 5500725722. Its totient is φ = 5500725720.

The previous prime is 5500725709. The next prime is 5500725749. The reversal of 5500725721 is 1275270055.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3657225625 + 1843500096 = 60475^2 + 42936^2 .

It is a cyclic number.

It is not a de Polignac number, because 5500725721 - 2¹³ = 5500717529 is a prime.

It is not a weakly prime, because it can be changed into another prime (5500725821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2750362860 + 2750362861.

It is an arithmetic number, because the mean of its divisors is an integer number (2750362861).

Almost surely, 2^5500725721 is an apocalyptic number.

It is an amenable number.

5500725721 is a deficient number, since it is larger than the sum of its proper divisors (1).

5500725721 is an equidigital number, since it uses as much as digits as its factorization.

5500725721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24500, while the sum is 34.

The square root of 5500725721 is about 74166.8775195505. The cubic root of 5500725721 is about 1765.2518020644.

Adding to 5500725721 its reverse (1275270055), we get a palindrome (6775995776).

The spelling of 5500725721 in words is "five billion, five hundred million, seven hundred twenty-five thousand, seven hundred twenty-one".