189205405399 has 2 divisors, whose sum is σ = 189205405400. Its totient is φ = 189205405398.

The previous prime is 189205405397. The next prime is 189205405423. The reversal of 189205405399 is 993504502981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 189205405399 - 2¹ = 189205405397 is a prime.

Together with 189205405397, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189205405391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94602702699 + 94602702700.

It is an arithmetic number, because the mean of its divisors is an integer number (94602702700).

Almost surely, 2^189205405399 is an apocalyptic number.

189205405399 is a deficient number, since it is larger than the sum of its proper divisors (1).

189205405399 is an equidigital number, since it uses as much as digits as its factorization.

189205405399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3499200, while the sum is 55.

The spelling of 189205405399 in words is "one hundred eighty-nine billion, two hundred five million, four hundred five thousand, three hundred ninety-nine".