641510643632 has 40 divisors (see below), whose sum is σ = 1255419648000. Its totient is φ = 317535570752.

The previous prime is 641510643629. The next prime is 641510643649. The reversal of 641510643632 is 236346015146.

It is a self number, because there is not a number n which added to its sum of digits gives 641510643632.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2333369 + ... + 2593767.

It is an arithmetic number, because the mean of its divisors is an integer number (31385491200).

Almost surely, 2^641510643632 is an apocalyptic number.

It is an amenable number.

641510643632 is a deficient number, since it is larger than the sum of its proper divisors (613909004368).

641510643632 is a wasteful number, since it uses less digits than its factorization.

641510643632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261953 (or 261947 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 41.

Adding to 641510643632 its reverse (236346015146), we get a palindrome (877856658778).

The spelling of 641510643632 in words is "six hundred forty-one billion, five hundred ten million, six hundred forty-three thousand, six hundred thirty-two".