6644631001 has 2 divisors, whose sum is σ = 6644631002. Its totient is φ = 6644631000.

The previous prime is 6644630959. The next prime is 6644631017. The reversal of 6644631001 is 1001364466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3329174601 + 3315456400 = 57699^2 + 57580^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6644631001 is a prime.

It is a super-2 number, since 2×6644631001² = 88302242278900524002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6644631031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3322315500 + 3322315501.

It is an arithmetic number, because the mean of its divisors is an integer number (3322315501).

Almost surely, 2^6644631001 is an apocalyptic number.

It is an amenable number.

6644631001 is a deficient number, since it is larger than the sum of its proper divisors (1).

6644631001 is an equidigital number, since it uses as much as digits as its factorization.

6644631001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 6644631001 is about 81514.6060592824. The cubic root of 6644631001 is about 1879.9961333292.

Adding to 6644631001 its reverse (1001364466), we get a palindrome (7645995467).

The spelling of 6644631001 in words is "six billion, six hundred forty-four million, six hundred thirty-one thousand, one".