66596244665 has 4 divisors (see below), whose sum is σ = 79915493604. Its totient is φ = 53276995728.

The previous prime is 66596244661. The next prime is 66596244721. The reversal of 66596244665 is 56644269566.

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

It can be written as a sum of positive squares in 2 ways, for example, as 41492060416 + 25104184249 = 203696^2 + 158443^2 .

It is a cyclic number.

It is not a de Polignac number, because 66596244665 - 2² = 66596244661 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66596244661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6659624462 + ... + 6659624471.

It is an arithmetic number, because the mean of its divisors is an integer number (19978873401).

Almost surely, 2^66596244665 is an apocalyptic number.

It is an amenable number.

66596244665 is a deficient number, since it is larger than the sum of its proper divisors (13319248939).

66596244665 is a wasteful number, since it uses less digits than its factorization.

66596244665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13319248938.

The product of its digits is 55987200, while the sum is 59.

The spelling of 66596244665 in words is "sixty-six billion, five hundred ninety-six million, two hundred forty-four thousand, six hundred sixty-five".