189205405423 has 2 divisors, whose sum is σ = 189205405424. Its totient is φ = 189205405422.

The previous prime is 189205405399. The next prime is 189205405429. The reversal of 189205405423 is 324504502981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 189205405423 - 2⁵ = 189205405391 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 189205405423.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189205405429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94602702711 + 94602702712.

It is an arithmetic number, because the mean of its divisors is an integer number (94602702712).

Almost surely, 2^189205405423 is an apocalyptic number.

189205405423 is a deficient number, since it is larger than the sum of its proper divisors (1).

189205405423 is an equidigital number, since it uses as much as digits as its factorization.

189205405423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 345600, while the sum is 43.

The spelling of 189205405423 in words is "one hundred eighty-nine billion, two hundred five million, four hundred five thousand, four hundred twenty-three".