641513113721 has 8 divisors (see below), whose sum is σ = 679256492544. Its totient is φ = 603770547520.

The previous prime is 641513113573. The next prime is 641513113817. The reversal of 641513113721 is 127311315146.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 641513113721 - 2¹⁰ = 641513112697 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (641513113421) by changing a digit.

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, 2311796 + ... + 2574378.

It is an arithmetic number, because the mean of its divisors is an integer number (84907061568).

Almost surely, 2^641513113721 is an apocalyptic number.

It is an amenable number.

641513113721 is a deficient number, since it is larger than the sum of its proper divisors (37743378823).

641513113721 is a wasteful number, since it uses less digits than its factorization.

641513113721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406311.

The product of its digits is 15120, while the sum is 35.

Adding to 641513113721 its reverse (127311315146), we get a palindrome (768824428867).

The spelling of 641513113721 in words is "six hundred forty-one billion, five hundred thirteen million, one hundred thirteen thousand, seven hundred twenty-one".