6644025001 has 2 divisors, whose sum is σ = 6644025002. Its totient is φ = 6644025000.

The previous prime is 6644024971. The next prime is 6644025043. The reversal of 6644025001 is 1005204466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4136419225 + 2507605776 = 64315^2 + 50076^2 .

It is a cyclic number.

It is not a de Polignac number, because 6644025001 - 2¹¹ = 6644022953 is a prime.

It is not a weakly prime, because it can be changed into another prime (6644029001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3322012500 + 3322012501.

It is an arithmetic number, because the mean of its divisors is an integer number (3322012501).

Almost surely, 2^6644025001 is an apocalyptic number.

It is an amenable number.

6644025001 is a deficient number, since it is larger than the sum of its proper divisors (1).

6644025001 is an equidigital number, since it uses as much as digits as its factorization.

6644025001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 6644025001 is about 81510.8888492820. Note that the first 4 decimals coincide. The cubic root of 6644025001 is about 1879.9389787988.

Adding to 6644025001 its reverse (1005204466), we get a palindrome (7649229467).

The spelling of 6644025001 in words is "six billion, six hundred forty-four million, twenty-five thousand, one".