66905320655317 has 4 divisors (see below), whose sum is σ = 66905711703936. Its totient is φ = 66904929606700.

The previous prime is 66905320655293. The next prime is 66905320655353. The reversal of 66905320655317 is 71355602350966.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66905320655317 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 (66905320655417) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 195267559 + ... + 195609892.

It is an arithmetic number, because the mean of its divisors is an integer number (16726427925984).

Almost surely, 2^{66905320655317} is an apocalyptic number.

It is an amenable number.

66905320655317 is a deficient number, since it is larger than the sum of its proper divisors (391048619).

66905320655317 is a wasteful number, since it uses less digits than its factorization.

66905320655317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391048618.

The product of its (nonzero) digits is 30618000, while the sum is 58.

The spelling of 66905320655317 in words is "sixty-six trillion, nine hundred five billion, three hundred twenty million, six hundred fifty-five thousand, three hundred seventeen".