189548778385 has 8 divisors (see below), whose sum is σ = 231750204840. Its totient is φ = 148777908864.

The previous prime is 189548778347. The next prime is 189548778389. The reversal of 189548778385 is 583877845981.

189548778385 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 435372²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1427932944 + 188120845441 = 37788^2 + 433729^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 189548778385 - 2¹³ = 189548770193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (189548778389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 357638940 + ... + 357639469.

It is an arithmetic number, because the mean of its divisors is an integer number (28968775605).

Almost surely, 2^189548778385 is an apocalyptic number.

It is an amenable number.

189548778385 is a deficient number, since it is larger than the sum of its proper divisors (42201426455).

189548778385 is an equidigital number, since it uses as much as digits as its factorization.

189548778385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 715278467.

The product of its digits is 541900800, while the sum is 73.

The spelling of 189548778385 in words is "one hundred eighty-nine billion, five hundred forty-eight million, seven hundred seventy-eight thousand, three hundred eighty-five".