64717665566 has 8 divisors (see below), whose sum is σ = 98037652104. Its totient is φ = 32038448200.

The previous prime is 64717665563. The next prime is 64717665599. The reversal of 64717665566 is 66556671746.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64717665563) 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, 160192040 + ... + 160192443.

It is an arithmetic number, because the mean of its divisors is an integer number (12254706513).

Almost surely, 2^64717665566 is an apocalyptic number.

64717665566 is a deficient number, since it is larger than the sum of its proper divisors (33319986538).

64717665566 is a wasteful number, since it uses less digits than its factorization.

64717665566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320384586.

The product of its digits is 38102400, while the sum is 59.

The spelling of 64717665566 in words is "sixty-four billion, seven hundred seventeen million, six hundred sixty-five thousand, five hundred sixty-six".