3661647625 has 8 divisors (see below), whose sum is σ = 4569736392. Its totient is φ = 2929318000.

The previous prime is 3661647611. The next prime is 3661647641. The reversal of 3661647625 is 5267461663.

It can be written as a sum of positive squares in 4 ways, for example, as 28933641 + 3632713984 = 5379^2 + 60272^2 .

It is not a de Polignac number, because 3661647625 - 2⁷ = 3661647497 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 14646466 + ... + 14646715.

It is an arithmetic number, because the mean of its divisors is an integer number (571217049).

Almost surely, 2^3661647625 is an apocalyptic number.

It is an amenable number.

3661647625 is a deficient number, since it is larger than the sum of its proper divisors (908088767).

3661647625 is an equidigital number, since it uses as much as digits as its factorization.

3661647625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29293196 (or 29293186 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 46.

The square root of 3661647625 is about 60511.5495174268. The cubic root of 3661647625 is about 1541.3177601787.

The spelling of 3661647625 in words is "three billion, six hundred sixty-one million, six hundred forty-seven thousand, six hundred twenty-five".