197793869549 has 2 divisors, whose sum is σ = 197793869550. Its totient is φ = 197793869548.

The previous prime is 197793869503. The next prime is 197793869587. The reversal of 197793869549 is 945968397791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155776249225 + 42017620324 = 394685^2 + 204982^2 .

It is a cyclic number.

It is not a de Polignac number, because 197793869549 - 2³⁶ = 129074392813 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 197793869549.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197793869249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98896934774 + 98896934775.

It is an arithmetic number, because the mean of its divisors is an integer number (98896934775).

Almost surely, 2^197793869549 is an apocalyptic number.

It is an amenable number.

197793869549 is a deficient number, since it is larger than the sum of its proper divisors (1).

197793869549 is an equidigital number, since it uses as much as digits as its factorization.

197793869549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 925888320, while the sum is 77.

The spelling of 197793869549 in words is "one hundred ninety-seven billion, seven hundred ninety-three million, eight hundred sixty-nine thousand, five hundred forty-nine".