664565501222771 has 8 divisors (see below), whose sum is σ = 693461050778880. Its totient is φ = 635670068110792.

The previous prime is 664565501222713. The next prime is 664565501222773. The reversal of 664565501222771 is 177222105565466.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664565501222771 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 664565501222771.

It is not an unprimeable number, because it can be changed into a prime (664565501222773) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17347415 + ... + 40374048.

It is an arithmetic number, because the mean of its divisors is an integer number (86682631347360).

Almost surely, 2^{664565501222771} is an apocalyptic number.

664565501222771 is a deficient number, since it is larger than the sum of its proper divisors (28895549556109).

664565501222771 is a wasteful number, since it uses less digits than its factorization.

664565501222771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58222065.

The product of its (nonzero) digits is 42336000, while the sum is 59.

The spelling of 664565501222771 in words is "six hundred sixty-four trillion, five hundred sixty-five billion, five hundred one million, two hundred twenty-two thousand, seven hundred seventy-one".