189663976081 has 2 divisors, whose sum is σ = 189663976082. Its totient is φ = 189663976080.

The previous prime is 189663976003. The next prime is 189663976129. The reversal of 189663976081 is 180679366981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 183219097681 + 6444878400 = 428041^2 + 80280^2 .

It is a cyclic number.

It is not a de Polignac number, because 189663976081 - 2¹⁷ = 189663845009 is a prime.

It is a super-2 number, since 2×189663976081² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (189663979081) 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, 94831988040 + 94831988041.

It is an arithmetic number, because the mean of its divisors is an integer number (94831988041).

Almost surely, 2^189663976081 is an apocalyptic number.

It is an amenable number.

189663976081 is a deficient number, since it is larger than the sum of its proper divisors (1).

189663976081 is an equidigital number, since it uses as much as digits as its factorization.

189663976081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23514624, while the sum is 64.

The spelling of 189663976081 in words is "one hundred eighty-nine billion, six hundred sixty-three million, nine hundred seventy-six thousand, eighty-one".