7975975727329 has 3 divisors (see below), whose sum is σ = 7975978551507. Its totient is φ = 7975972903152.

The previous prime is 7975975727261. The next prime is 7975975727353. The reversal of 7975975727329 is 9237275795797.

The square root of 7975975727329 is 2824177.

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., 6834172350625 + 1141803376704 = 2614225^2 + 1068552^2 .

It is not a de Polignac number, because 7975975727329 - 2⁷ = 7975975727201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7975975727029) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1412089 + ... + 4236265.

It is an arithmetic number, because the mean of its divisors is an integer number (2658659517169).

Almost surely, 2^{7975975727329} is an apocalyptic number.

7975975727329 is the 2824177-th square number.

7975975727329 is the 1412089-th centered octagonal number.

It is an amenable number.

7975975727329 is a deficient number, since it is larger than the sum of its proper divisors (2824178).

7975975727329 is an frugal number, since it uses more digits than its factorization.

7975975727329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5648354 (or 2824177 counting only the distinct ones).

The product of its digits is 3675690900, while the sum is 79.

The spelling of 7975975727329 in words is "seven trillion, nine hundred seventy-five billion, nine hundred seventy-five million, seven hundred twenty-seven thousand, three hundred twenty-nine".