64543666165 has 48 divisors (see below), whose sum is σ = 93659068800. Its totient is φ = 42258529280.

The previous prime is 64543666163. The next prime is 64543666193. The reversal of 64543666165 is 56166634546.

It is not a de Polignac number, because 64543666165 - 2¹ = 64543666163 is a prime.

It is a hoax number, since the sum of its digits (52) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64543666163) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 277311 + ... + 453859.

It is an arithmetic number, because the mean of its divisors is an integer number (1951230600).

Almost surely, 2^64543666165 is an apocalyptic number.

It is an amenable number.

64543666165 is a deficient number, since it is larger than the sum of its proper divisors (29115402635).

64543666165 is a wasteful number, since it uses less digits than its factorization.

64543666165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176622 (or 176605 counting only the distinct ones).

The product of its digits is 9331200, while the sum is 52.

The spelling of 64543666165 in words is "sixty-four billion, five hundred forty-three million, six hundred sixty-six thousand, one hundred sixty-five".