7443685521 has 6 divisors (see below), whose sum is σ = 10751990210. Its totient is φ = 4962457008.

The previous prime is 7443685517. The next prime is 7443685531. The reversal of 7443685521 is 1255863447.

7443685521 is a `hidden beast` number, since 7 + 4 + 43 + 6 + 85 + 521 = 666.

7443685521 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 7354949121 + 88736400 = 85761^2 + 9420^2 .

It is not a de Polignac number, because 7443685521 - 2² = 7443685517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7443685531) 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 5 ways as a sum of consecutive naturals, for example, 413538076 + ... + 413538093.

Almost surely, 2^7443685521 is an apocalyptic number.

It is an amenable number.

7443685521 is a deficient number, since it is larger than the sum of its proper divisors (3308304689).

7443685521 is a wasteful number, since it uses less digits than its factorization.

7443685521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 827076175 (or 827076172 counting only the distinct ones).

The product of its digits is 806400, while the sum is 45.

The square root of 7443685521 is about 86276.7959592844. The cubic root of 7443685521 is about 1952.5223131170.

The spelling of 7443685521 in words is "seven billion, four hundred forty-three million, six hundred eighty-five thousand, five hundred twenty-one".