640446456211 has 4 divisors (see below), whose sum is σ = 662530816800. Its totient is φ = 618362095624.

The previous prime is 640446456119. The next prime is 640446456239. The reversal of 640446456211 is 112654644046.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 640446456211 - 2¹⁷ = 640446325139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640446456511) 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 3 ways as a sum of consecutive naturals, for example, 11042180251 + ... + 11042180308.

It is an arithmetic number, because the mean of its divisors is an integer number (165632704200).

Almost surely, 2^640446456211 is an apocalyptic number.

640446456211 is a deficient number, since it is larger than the sum of its proper divisors (22084360589).

640446456211 is a wasteful number, since it uses less digits than its factorization.

640446456211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22084360588.

The product of its (nonzero) digits is 552960, while the sum is 43.

The spelling of 640446456211 in words is "six hundred forty billion, four hundred forty-six million, four hundred fifty-six thousand, two hundred eleven".