646008001 has 2 divisors, whose sum is σ = 646008002. Its totient is φ = 646008000.

The previous prime is 646007993. The next prime is 646008017. The reversal of 646008001 is 100800646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 634284225 + 11723776 = 25185^2 + 3424^2 .

It is a cyclic number.

It is not a de Polignac number, because 646008001 - 2³ = 646007993 is a prime.

It is not a weakly prime, because it can be changed into another prime (646008071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323004000 + 323004001.

It is an arithmetic number, because the mean of its divisors is an integer number (323004001).

Almost surely, 2^646008001 is an apocalyptic number.

It is an amenable number.

646008001 is a deficient number, since it is larger than the sum of its proper divisors (1).

646008001 is an equidigital number, since it uses as much as digits as its factorization.

646008001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 646008001 is about 25416.6874513576. The cubic root of 646008001 is about 864.4621160624.

Adding to 646008001 its reverse (100800646), we get a palindrome (746808647).

The spelling of 646008001 in words is "six hundred forty-six million, eight thousand, one".