667533118729 has 3 divisors (see below), whose sum is σ = 667533935757. Its totient is φ = 667532301702.

The previous prime is 667533118723. The next prime is 667533118751. The reversal of 667533118729 is 927811335766.

The square root of 667533118729 is 817027.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 667533118729 - 2¹¹ = 667533116681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667533118723) 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 2 ways as a sum of consecutive naturals, for example, 408514 + ... + 1225540.

It is an arithmetic number, because the mean of its divisors is an integer number (222511311919).

Almost surely, 2^667533118729 is an apocalyptic number.

667533118729 is the 817027-th square number.

667533118729 is the 408514-th centered octagonal number.

It is an amenable number.

667533118729 is a deficient number, since it is larger than the sum of its proper divisors (817028).

667533118729 is an frugal number, since it uses more digits than its factorization.

667533118729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1634054 (or 817027 counting only the distinct ones).

The product of its digits is 11430720, while the sum is 58.

The spelling of 667533118729 in words is "six hundred sixty-seven billion, five hundred thirty-three million, one hundred eighteen thousand, seven hundred twenty-nine".