7065547721 has 4 divisors (see below), whose sum is σ = 7372745472. Its totient is φ = 6758349972.

The previous prime is 7065547681. The next prime is 7065547739. The reversal of 7065547721 is 1277455607.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7065547721 - 2¹⁴ = 7065531337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7065547771) 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, 153598841 + ... + 153598886.

It is an arithmetic number, because the mean of its divisors is an integer number (1843186368).

Almost surely, 2^7065547721 is an apocalyptic number.

It is an amenable number.

7065547721 is a deficient number, since it is larger than the sum of its proper divisors (307197751).

7065547721 is a wasteful number, since it uses less digits than its factorization.

7065547721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307197750.

The product of its (nonzero) digits is 411600, while the sum is 44.

The square root of 7065547721 is about 84056.8124603830. The cubic root of 7065547721 is about 1918.8835125775.

The spelling of 7065547721 in words is "seven billion, sixty-five million, five hundred forty-seven thousand, seven hundred twenty-one".