189663967853 has 2 divisors, whose sum is σ = 189663967854. Its totient is φ = 189663967852.

The previous prime is 189663967811. The next prime is 189663967859. The reversal of 189663967853 is 358769366981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 186281149609 + 3382818244 = 431603^2 + 58162^2 .

It is an emirp because it is prime and its reverse (358769366981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 189663967853 - 2¹⁴ = 189663951469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189663967859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94831983926 + 94831983927.

It is an arithmetic number, because the mean of its divisors is an integer number (94831983927).

Almost surely, 2^189663967853 is an apocalyptic number.

It is an amenable number.

189663967853 is a deficient number, since it is larger than the sum of its proper divisors (1).

189663967853 is an equidigital number, since it uses as much as digits as its factorization.

189663967853 is an evil number, because the sum of its binary digits is even.

The product of its digits is 352719360, while the sum is 71.

The spelling of 189663967853 in words is "one hundred eighty-nine billion, six hundred sixty-three million, nine hundred sixty-seven thousand, eight hundred fifty-three".