641344851 has 16 divisors (see below), whose sum is σ = 1085875200. Its totient is φ = 366482664.

The previous prime is 641344817. The next prime is 641344859. The reversal of 641344851 is 158443146.

641344851 is a `hidden beast` number, since 641 + 3 + 4 + 4 + 8 + 5 + 1 = 666.

It is not a de Polignac number, because 641344851 - 2⁶ = 641344787 is a prime.

It is a super-2 number, since 2×641344851² = 822646435808424402, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (641344859) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1696491 + ... + 1696868.

It is an arithmetic number, because the mean of its divisors is an integer number (67867200).

Almost surely, 2^641344851 is an apocalyptic number.

641344851 is a deficient number, since it is larger than the sum of its proper divisors (444530349).

641344851 is a wasteful number, since it uses less digits than its factorization.

641344851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3393375 (or 3393369 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

The square root of 641344851 is about 25324.7872843979. The cubic root of 641344851 is about 862.3770773781.

Adding to 641344851 its reverse (158443146), we get a palindrome (799787997).

The spelling of 641344851 in words is "six hundred forty-one million, three hundred forty-four thousand, eight hundred fifty-one".