1995079975729 has 3 divisors (see below), whose sum is σ = 1995081388203. Its totient is φ = 1995078563256.

The previous prime is 1995079975661. The next prime is 1995079975739. The reversal of 1995079975729 is 9275799705991.

The square root of 1995079975729 is 1412473.

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., 54207480625 + 1940872495104 = 232825^2 + 1393152^2 .

It is not a de Polignac number, because 1995079975729 - 2¹¹ = 1995079973681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1995079975739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 706237 + ... + 2118709.

It is an arithmetic number, because the mean of its divisors is an integer number (665027129401).

Almost surely, 2^{1995079975729} is an apocalyptic number.

1995079975729 is the 1412473-rd square number.

1995079975729 is the 706237-th centered octagonal number.

It is an amenable number.

1995079975729 is a deficient number, since it is larger than the sum of its proper divisors (1412474).

1995079975729 is an frugal number, since it uses more digits than its factorization.

1995079975729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2824946 (or 1412473 counting only the distinct ones).

The product of its (nonzero) digits is 1012690350, while the sum is 79.

The spelling of 1995079975729 in words is "one trillion, nine hundred ninety-five billion, seventy-nine million, nine hundred seventy-five thousand, seven hundred twenty-nine".