3272165721 has 64 divisors (see below), whose sum is σ = 5427628800. Its totient is φ = 1931558400.

The previous prime is 3272165681. The next prime is 3272165737. The reversal of 3272165721 is 1275612723.

3272165721 is a `hidden beast` number, since 3 + 2 + 72 + 16 + 572 + 1 = 666.

It is not a de Polignac number, because 3272165721 - 2¹⁰ = 3272164697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3272165791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1973925 + ... + 1975581.

It is an arithmetic number, because the mean of its divisors is an integer number (84806700).

Almost surely, 2^3272165721 is an apocalyptic number.

It is an amenable number.

3272165721 is a deficient number, since it is larger than the sum of its proper divisors (2155463079).

3272165721 is a wasteful number, since it uses less digits than its factorization.

3272165721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1847 (or 1841 counting only the distinct ones).

The product of its digits is 35280, while the sum is 36.

The square root of 3272165721 is about 57202.8471406800. The cubic root of 3272165721 is about 1484.6078874936.

The spelling of 3272165721 in words is "three billion, two hundred seventy-two million, one hundred sixty-five thousand, seven hundred twenty-one".