66445505363 has 4 divisors (see below), whose sum is σ = 70354064520. Its totient is φ = 62536946208.

The previous prime is 66445505351. The next prime is 66445505377. The reversal of 66445505363 is 36350554466.

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 66445505363 - 2¹⁰ = 66445504339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66445505263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1954279553 + ... + 1954279586.

It is an arithmetic number, because the mean of its divisors is an integer number (17588516130).

Almost surely, 2^66445505363 is an apocalyptic number.

66445505363 is a deficient number, since it is larger than the sum of its proper divisors (3908559157).

66445505363 is a wasteful number, since it uses less digits than its factorization.

66445505363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3908559156.

The product of its (nonzero) digits is 3888000, while the sum is 47.

The spelling of 66445505363 in words is "sixty-six billion, four hundred forty-five million, five hundred five thousand, three hundred sixty-three".