961649704861 has 2 divisors, whose sum is σ = 961649704862. Its totient is φ = 961649704860.

The previous prime is 961649704853. The next prime is 961649704867. The reversal of 961649704861 is 168407946169.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 785715596836 + 175934108025 = 886406^2 + 419445^2 .

It is an emirp because it is prime and its reverse (168407946169) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 961649704861 - 2³ = 961649704853 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 961649704861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (961649704867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 480824852430 + 480824852431.

It is an arithmetic number, because the mean of its divisors is an integer number (480824852431).

Almost surely, 2^961649704861 is an apocalyptic number.

It is an amenable number.

961649704861 is a deficient number, since it is larger than the sum of its proper divisors (1).

961649704861 is an equidigital number, since it uses as much as digits as its factorization.

961649704861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15676416, while the sum is 61.

The spelling of 961649704861 in words is "nine hundred sixty-one billion, six hundred forty-nine million, seven hundred four thousand, eight hundred sixty-one".