19961223613 has 2 divisors, whose sum is σ = 19961223614. Its totient is φ = 19961223612.

The previous prime is 19961223593. The next prime is 19961223619. The reversal of 19961223613 is 31632216991.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19959473284 + 1750329 = 141278^2 + 1323^2 .

It is a cyclic number.

It is not a de Polignac number, because 19961223613 - 2³³ = 11371289021 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19961223613.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19961223619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9980611806 + 9980611807.

It is an arithmetic number, because the mean of its divisors is an integer number (9980611807).

Almost surely, 2^19961223613 is an apocalyptic number.

It is an amenable number.

19961223613 is a deficient number, since it is larger than the sum of its proper divisors (1).

19961223613 is an equidigital number, since it uses as much as digits as its factorization.

19961223613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 104976, while the sum is 43.

The spelling of 19961223613 in words is "nineteen billion, nine hundred sixty-one million, two hundred twenty-three thousand, six hundred thirteen".