961998473272813 has 2 divisors, whose sum is σ = 961998473272814. Its totient is φ = 961998473272812.

The previous prime is 961998473272729. The next prime is 961998473272901. The reversal of 961998473272813 is 318272374899169.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 738866669138404 + 223131804134409 = 27182102^2 + 14937597^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-961998473272813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (961998473279813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 480999236636406 + 480999236636407.

It is an arithmetic number, because the mean of its divisors is an integer number (480999236636407).

Almost surely, 2^{961998473272813} is an apocalyptic number.

It is an amenable number.

961998473272813 is a deficient number, since it is larger than the sum of its proper divisors (1).

961998473272813 is an equidigital number, since it uses as much as digits as its factorization.

961998473272813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1975228416, while the sum is 79.

The spelling of 961998473272813 in words is "nine hundred sixty-one trillion, nine hundred ninety-eight billion, four hundred seventy-three million, two hundred seventy-two thousand, eight hundred thirteen".