4331645521 has 12 divisors (see below), whose sum is σ = 5039999280. Its totient is φ = 3711994440.

The previous prime is 4331645519. The next prime is 4331645557. The reversal of 4331645521 is 1255461334.

It is not a de Polignac number, because 4331645521 - 2¹ = 4331645519 is a prime.

It is a super-2 number, since 2×4331645521² = 37526305839198722882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4331645621) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 311250 + ... + 324868.

It is an arithmetic number, because the mean of its divisors is an integer number (419999940).

Almost surely, 2^4331645521 is an apocalyptic number.

It is an amenable number.

4331645521 is a deficient number, since it is larger than the sum of its proper divisors (708353759).

4331645521 is a wasteful number, since it uses less digits than its factorization.

4331645521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20124 (or 20117 counting only the distinct ones).

The product of its digits is 43200, while the sum is 34.

The square root of 4331645521 is about 65815.2377569207. The cubic root of 4331645521 is about 1630.1127201961.

The spelling of 4331645521 in words is "four billion, three hundred thirty-one million, six hundred forty-five thousand, five hundred twenty-one".