646252252646 has 32 divisors (see below), whose sum is σ = 1301543002368. Its totient is φ = 232418391840.

The previous prime is 646252252609. The next prime is 646252252651.

646252252646 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 646252252594 and 646252252603.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 161399660 + ... + 161403663.

It is an arithmetic number, because the mean of its divisors is an integer number (40673218824).

Almost surely, 2^646252252646 is an apocalyptic number.

646252252646 is an abundant number, since it is smaller than the sum of its proper divisors (655290749722).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646252252646 is a wasteful number, since it uses less digits than its factorization.

646252252646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322803356.

The product of its digits is 8294400, while the sum is 50.

It can be divided in two parts, 646252 and 252646, that added together give a palindrome (898898).

The spelling of 646252252646 in words is "six hundred forty-six billion, two hundred fifty-two million, two hundred fifty-two thousand, six hundred forty-six".