5506065721 has 4 divisors (see below), whose sum is σ = 5929609252. Its totient is φ = 5082522192.

The previous prime is 5506065667. The next prime is 5506065739. The reversal of 5506065721 is 1275606055.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 355850496 + 5150215225 = 18864^2 + 71765^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5506065721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5506065751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 211771746 + ... + 211771771.

It is an arithmetic number, because the mean of its divisors is an integer number (1482402313).

Almost surely, 2^5506065721 is an apocalyptic number.

It is an amenable number.

5506065721 is a deficient number, since it is larger than the sum of its proper divisors (423543531).

5506065721 is a wasteful number, since it uses less digits than its factorization.

5506065721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423543530.

The product of its (nonzero) digits is 63000, while the sum is 37.

The square root of 5506065721 is about 74202.8686844383. The cubic root of 5506065721 is about 1765.8228416210.

The spelling of 5506065721 in words is "five billion, five hundred six million, sixty-five thousand, seven hundred twenty-one".