194778675378 has 64 divisors (see below), whose sum is σ = 495209376000. Its totient is φ = 55591045632.

The previous prime is 194778675361. The next prime is 194778675433. The reversal of 194778675378 is 873576877491.

194778675378 is a `hidden beast` number, since 1 + 9 + 4 + 7 + 7 + 86 + 7 + 537 + 8 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 73828 + ... + 628496.

It is an arithmetic number, because the mean of its divisors is an integer number (7737646500).

Almost surely, 2^194778675378 is an apocalyptic number.

194778675378 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 194778675378, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (247604688000).

194778675378 is an abundant number, since it is smaller than the sum of its proper divisors (300430700622).

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

194778675378 is a wasteful number, since it uses less digits than its factorization.

194778675378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555616 (or 555610 counting only the distinct ones).

The product of its digits is 497871360, while the sum is 72.

The spelling of 194778675378 in words is "one hundred ninety-four billion, seven hundred seventy-eight million, six hundred seventy-five thousand, three hundred seventy-eight".