64163541805 has 12 divisors (see below), whose sum is σ = 84632242716. Its totient is φ = 46664393600.

The previous prime is 64163541803. The next prime is 64163541811. The reversal of 64163541805 is 50814536146.

It can be written as a sum of positive squares in 2 ways, for example, as 11446004196 + 52717537609 = 106986^2 + 229603^2 .

It is not a de Polignac number, because 64163541805 - 2¹ = 64163541803 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 (64163541803) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53027116 + ... + 53028325.

It is an arithmetic number, because the mean of its divisors is an integer number (7052686893).

Almost surely, 2^64163541805 is an apocalyptic number.

It is an amenable number.

64163541805 is a deficient number, since it is larger than the sum of its proper divisors (20468700911).

64163541805 is a wasteful number, since it uses less digits than its factorization.

64163541805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106055468 (or 106055457 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 43.

The spelling of 64163541805 in words is "sixty-four billion, one hundred sixty-three million, five hundred forty-one thousand, eight hundred five".