64441645565 has 16 divisors (see below), whose sum is σ = 85951673856. Its totient is φ = 45982372800.

The previous prime is 64441645531. The next prime is 64441645577. The reversal of 64441645565 is 56554614446.

It is not a de Polignac number, because 64441645565 - 2⁶ = 64441645501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 11050541 + ... + 11056370.

It is an arithmetic number, because the mean of its divisors is an integer number (5371979616).

Almost surely, 2^64441645565 is an apocalyptic number.

It is an amenable number.

64441645565 is a deficient number, since it is larger than the sum of its proper divisors (21510028291).

64441645565 is a wasteful number, since it uses less digits than its factorization.

64441645565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22106980.

The product of its digits is 6912000, while the sum is 50.

The spelling of 64441645565 in words is "sixty-four billion, four hundred forty-one million, six hundred forty-five thousand, five hundred sixty-five".