196561542349 has 2 divisors, whose sum is σ = 196561542350. Its totient is φ = 196561542348.

The previous prime is 196561542323. The next prime is 196561542377. The reversal of 196561542349 is 943245165691.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127765498249 + 68796044100 = 357443^2 + 262290^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-196561542349 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 196561542349.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (196561542389) 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 as a sum of consecutive naturals, namely, 98280771174 + 98280771175.

It is an arithmetic number, because the mean of its divisors is an integer number (98280771175).

Almost surely, 2^196561542349 is an apocalyptic number.

It is an amenable number.

196561542349 is a deficient number, since it is larger than the sum of its proper divisors (1).

196561542349 is an equidigital number, since it uses as much as digits as its factorization.

196561542349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6998400, while the sum is 55.

The spelling of 196561542349 in words is "one hundred ninety-six billion, five hundred sixty-one million, five hundred forty-two thousand, three hundred forty-nine".