65664323565505 has 64 divisors (see below), whose sum is σ = 91177279852032. Its totient is φ = 44468835747840.

The previous prime is 65664323565481. The next prime is 65664323565509. The reversal of 65664323565505 is 50556532346656.

It is a de Polignac number, because none of the positive numbers 2^k-65664323565505 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65664323565509) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2870309127 + ... + 2870332003.

It is an arithmetic number, because the mean of its divisors is an integer number (1424644997688).

Almost surely, 2^{65664323565505} is an apocalyptic number.

It is an amenable number.

65664323565505 is a deficient number, since it is larger than the sum of its proper divisors (25512956286527).

65664323565505 is a wasteful number, since it uses less digits than its factorization.

65664323565505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26074.

The product of its (nonzero) digits is 291600000, while the sum is 61.

The spelling of 65664323565505 in words is "sixty-five trillion, six hundred sixty-four billion, three hundred twenty-three million, five hundred sixty-five thousand, five hundred five".