646331133646 has 32 divisors (see below), whose sum is σ = 1073566287360. Its totient is φ = 289362110400.

The previous prime is 646331133619. The next prime is 646331133647.

646331133646 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 646331133596 and 646331133605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646331133647) 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 15 ways as a sum of consecutive naturals, for example, 12401290 + ... + 12453298.

It is an arithmetic number, because the mean of its divisors is an integer number (33548946480).

Almost surely, 2^646331133646 is an apocalyptic number.

646331133646 is a deficient number, since it is larger than the sum of its proper divisors (427235153714).

646331133646 is a wasteful number, since it uses less digits than its factorization.

646331133646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60520.

The product of its digits is 1679616, while the sum is 46.

It can be divided in two parts, 646331 and 133646, that added together give a palindrome (779977).

The spelling of 646331133646 in words is "six hundred forty-six billion, three hundred thirty-one million, one hundred thirty-three thousand, six hundred forty-six".