646006386601 has 4 divisors (see below), whose sum is σ = 646855278804. Its totient is φ = 645157494400.

The previous prime is 646006386593. The next prime is 646006386647. The reversal of 646006386601 is 106683600646.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25440569001 + 620565817600 = 159501^2 + 787760^2 .

It is a cyclic number.

It is not a de Polignac number, because 646006386601 - 2³ = 646006386593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646006386401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 424444960 + ... + 424446481.

It is an arithmetic number, because the mean of its divisors is an integer number (161713819701).

Almost surely, 2^646006386601 is an apocalyptic number.

It is an amenable number.

646006386601 is a deficient number, since it is larger than the sum of its proper divisors (848892203).

646006386601 is an equidigital number, since it uses as much as digits as its factorization.

646006386601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 848892202.

The product of its (nonzero) digits is 746496, while the sum is 46.

The spelling of 646006386601 in words is "six hundred forty-six billion, six million, three hundred eighty-six thousand, six hundred one".