664552236117727 has 4 divisors (see below), whose sum is σ = 664562012031720. Its totient is φ = 664542460203736.

The previous prime is 664552236117677. The next prime is 664552236117797. The reversal of 664552236117727 is 727711632255466.

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 664552236117727 - 2⁷ = 664552236117599 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 (664552236117797) 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, 4887855028 + ... + 4887990985.

It is an arithmetic number, because the mean of its divisors is an integer number (166140503007930).

Almost surely, 2^{664552236117727} is an apocalyptic number.

664552236117727 is a deficient number, since it is larger than the sum of its proper divisors (9775913993).

664552236117727 is an equidigital number, since it uses as much as digits as its factorization.

664552236117727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9775913992.

The product of its digits is 177811200, while the sum is 64.

The spelling of 664552236117727 in words is "six hundred sixty-four trillion, five hundred fifty-two billion, two hundred thirty-six million, one hundred seventeen thousand, seven hundred twenty-seven".