718793665489 has 3 divisors (see below), whose sum is σ = 718794513307. Its totient is φ = 718792817672.

The previous prime is 718793665487. The next prime is 718793665519. The reversal of 718793665489 is 984566397817.

The square root of 718793665489 is 847817.

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 can be written as a sum of positive squares in only one way, i.e., 218673140625 + 500120524864 = 467625^2 + 707192^2 .

It is not a de Polignac number, because 718793665489 - 2¹ = 718793665487 is a prime.

It is a super-2 number, since 2×718793665489² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (718793665481) 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 2 ways as a sum of consecutive naturals, for example, 423909 + ... + 1271725.

Almost surely, 2^718793665489 is an apocalyptic number.

718793665489 is the 847817-th square number.

718793665489 is the 423909-th centered octagonal number.

It is an amenable number.

718793665489 is a deficient number, since it is larger than the sum of its proper divisors (847818).

718793665489 is an frugal number, since it uses more digits than its factorization.

718793665489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1695634 (or 847817 counting only the distinct ones).

The product of its digits is 548674560, while the sum is 73.

The spelling of 718793665489 in words is "seven hundred eighteen billion, seven hundred ninety-three million, six hundred sixty-five thousand, four hundred eighty-nine".