3221665025 has 6 divisors (see below), whose sum is σ = 3994864662. Its totient is φ = 2577332000.

The previous prime is 3221665021. The next prime is 3221665063. The reversal of 3221665025 is 5205661223.

It can be written as a sum of positive squares in 3 ways, for example, as 933669136 + 2287995889 = 30556^2 + 47833^2 .

It is not a de Polignac number, because 3221665025 - 2² = 3221665021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3221664982 and 3221665000.

It is not an unprimeable number, because it can be changed into a prime (3221665021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 64433276 + ... + 64433325.

It is an arithmetic number, because the mean of its divisors is an integer number (665810777).

Almost surely, 2^3221665025 is an apocalyptic number.

It is an amenable number.

3221665025 is a deficient number, since it is larger than the sum of its proper divisors (773199637).

3221665025 is a wasteful number, since it uses less digits than its factorization.

3221665025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128866611 (or 128866606 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 3221665025 is about 56759.7130454339. The cubic root of 3221665025 is about 1476.9307321822.

The spelling of 3221665025 in words is "three billion, two hundred twenty-one million, six hundred sixty-five thousand, twenty-five".