641311172052 has 12 divisors (see below), whose sum is σ = 1496392734816. Its totient is φ = 213770390680.

The previous prime is 641311172009. The next prime is 641311172057. The reversal of 641311172052 is 250271113146.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×641311172052² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641311172057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26721298824 + ... + 26721298847.

It is an arithmetic number, because the mean of its divisors is an integer number (124699394568).

Almost surely, 2^641311172052 is an apocalyptic number.

It is an amenable number.

641311172052 is an abundant number, since it is smaller than the sum of its proper divisors (855081562764).

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

641311172052 is a wasteful number, since it uses less digits than its factorization.

641311172052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53442597678 (or 53442597676 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 33.

Adding to 641311172052 its reverse (250271113146), we get a palindrome (891582285198).

The spelling of 641311172052 in words is "six hundred forty-one billion, three hundred eleven million, one hundred seventy-two thousand, fifty-two".