19965288953 has 2 divisors, whose sum is σ = 19965288954. Its totient is φ = 19965288952.

The previous prime is 19965288913. The next prime is 19965288979. The reversal of 19965288953 is 35988256991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13071806224 + 6893482729 = 114332^2 + 83027^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19965288953 is a prime.

It is a super-2 number, since 2×19965288953² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19965288953.

It is not a weakly prime, because it can be changed into another prime (19965288913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9982644476 + 9982644477.

It is an arithmetic number, because the mean of its divisors is an integer number (9982644477).

Almost surely, 2^19965288953 is an apocalyptic number.

It is an amenable number.

19965288953 is a deficient number, since it is larger than the sum of its proper divisors (1).

19965288953 is an equidigital number, since it uses as much as digits as its factorization.

19965288953 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41990400, while the sum is 65.

The spelling of 19965288953 in words is "nineteen billion, nine hundred sixty-five million, two hundred eighty-eight thousand, nine hundred fifty-three".