189778435245 has 144 divisors (see below), whose sum is σ = 407563158912. Its totient is φ = 82981895040.

The previous prime is 189778435181. The next prime is 189778435247. The reversal of 189778435245 is 542534877981.

189778435245 is a `hidden beast` number, since 1 + 8 + 97 + 78 + 435 + 2 + 45 = 666.

It is not a de Polignac number, because 189778435245 - 2⁶ = 189778435181 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189778435247) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 4478055 + ... + 4520235.

Almost surely, 2^189778435245 is an apocalyptic number.

189778435245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

189778435245 is an abundant number, since it is smaller than the sum of its proper divisors (217784723667).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

189778435245 is an equidigital number, since it uses as much as digits as its factorization.

189778435245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42254 (or 42219 counting only the distinct ones).

The product of its digits is 67737600, while the sum is 63.

The spelling of 189778435245 in words is "one hundred eighty-nine billion, seven hundred seventy-eight million, four hundred thirty-five thousand, two hundred forty-five".