641872466005 has 4 divisors (see below), whose sum is σ = 770246959212. Its totient is φ = 513497972800.

The previous prime is 641872465981. The next prime is 641872466017. The reversal of 641872466005 is 500664278146.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 500664278146 = 2 ⋅250332139073.

It can be written as a sum of positive squares in 2 ways, for example, as 472410157041 + 169462308964 = 687321^2 + 411658^2 .

It is not a de Polignac number, because 641872466005 - 2³⁷ = 504433512533 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 641872466005.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64187246596 + ... + 64187246605.

It is an arithmetic number, because the mean of its divisors is an integer number (192561739803).

Almost surely, 2^641872466005 is an apocalyptic number.

It is an amenable number.

641872466005 is a deficient number, since it is larger than the sum of its proper divisors (128374493207).

641872466005 is a wasteful number, since it uses less digits than its factorization.

641872466005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128374493206.

The product of its (nonzero) digits is 1935360, while the sum is 49.

The spelling of 641872466005 in words is "six hundred forty-one billion, eight hundred seventy-two million, four hundred sixty-six thousand, five".