19844530678 has 48 divisors (see below), whose sum is σ = 37166012784. Its totient is φ = 7894817280.

The previous prime is 19844530649. The next prime is 19844530703. The reversal of 19844530678 is 87603544891.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 40033 + ... + 203203.

It is an arithmetic number, because the mean of its divisors is an integer number (774291933).

Almost surely, 2^19844530678 is an apocalyptic number.

19844530678 is a deficient number, since it is larger than the sum of its proper divisors (17321482106).

19844530678 is a wasteful number, since it uses less digits than its factorization.

19844530678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163277 (or 163270 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 55.

The spelling of 19844530678 in words is "nineteen billion, eight hundred forty-four million, five hundred thirty thousand, six hundred seventy-eight".