7539648221 has 16 divisors (see below), whose sum is σ = 8759218176. Its totient is φ = 6356004336.

The previous prime is 7539648169. The next prime is 7539648227. The reversal of 7539648221 is 1228469357.

It is a cyclic number.

It is not a de Polignac number, because 7539648221 - 2⁶ = 7539648157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7539648227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 291020 + ... + 315866.

It is an arithmetic number, because the mean of its divisors is an integer number (547451136).

Almost surely, 2^7539648221 is an apocalyptic number.

It is an amenable number.

7539648221 is a deficient number, since it is larger than the sum of its proper divisors (1219569955).

7539648221 is a wasteful number, since it uses less digits than its factorization.

7539648221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25568.

The product of its digits is 725760, while the sum is 47.

The square root of 7539648221 is about 86831.1477581634. The cubic root of 7539648221 is about 1960.8770388593.

The spelling of 7539648221 in words is "seven billion, five hundred thirty-nine million, six hundred forty-eight thousand, two hundred twenty-one".