65664075545243 has 4 divisors (see below), whose sum is σ = 75044657766000. Its totient is φ = 56283493324488.

The previous prime is 65664075545209. The next prime is 65664075545317. The reversal of 65664075545243 is 34254557046656.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 65664075545243 - 2²² = 65664071350939 is a prime.

It is a super-2 number, since 2×65664075545243² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65664075542243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4690291110368 + ... + 4690291110381.

It is an arithmetic number, because the mean of its divisors is an integer number (18761164441500).

Almost surely, 2^{65664075545243} is an apocalyptic number.

65664075545243 is a deficient number, since it is larger than the sum of its proper divisors (9380582220757).

65664075545243 is an equidigital number, since it uses as much as digits as its factorization.

65664075545243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9380582220756.

The product of its (nonzero) digits is 362880000, while the sum is 62.

The spelling of 65664075545243 in words is "sixty-five trillion, six hundred sixty-four billion, seventy-five million, five hundred forty-five thousand, two hundred forty-three".