644641662701711 has 8 divisors (see below), whose sum is σ = 682747592798304. Its totient is φ = 606556380637440.

The previous prime is 644641662701639. The next prime is 644641662701717. The reversal of 644641662701711 is 117107266146446.

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

It is not a de Polignac number, because 644641662701711 - 2³⁴ = 644624482832527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644641662701717) 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, 5161943795 + ... + 5162068676.

It is an arithmetic number, because the mean of its divisors is an integer number (85343449099788).

Almost surely, 2^{644641662701711} is an apocalyptic number.

644641662701711 is a deficient number, since it is larger than the sum of its proper divisors (38105930096593).

644641662701711 is a wasteful number, since it uses less digits than its factorization.

644641662701711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10324016161.

The product of its (nonzero) digits is 8128512, while the sum is 56.

The spelling of 644641662701711 in words is "six hundred forty-four trillion, six hundred forty-one billion, six hundred sixty-two million, seven hundred one thousand, seven hundred eleven".