195249980641 has 9 divisors (see below), whose sum is σ = 196333660051. Its totient is φ = 194172257272.

The previous prime is 195249980621. The next prime is 195249980669. The reversal of 195249980641 is 146089942591.

The square root of 195249980641 is 441871.

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

It can be written as a sum of positive squares in only one way, i.e., 191305638225 + 3944342416 = 437385^2 + 62804^2 .

It is not a de Polignac number, because 195249980641 - 2⁹ = 195249980129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (195249980621) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 87047466 + ... + 87049708.

Almost surely, 2^195249980641 is an apocalyptic number.

195249980641 is the 441871-st square number.

195249980641 is the 220936-th centered octagonal number.

It is an amenable number.

195249980641 is a deficient number, since it is larger than the sum of its proper divisors (1083679410).

195249980641 is an frugal number, since it uses more digits than its factorization.

195249980641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4880 (or 2440 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 58.

The spelling of 195249980641 in words is "one hundred ninety-five billion, two hundred forty-nine million, nine hundred eighty thousand, six hundred forty-one".