19478411778 has 32 divisors (see below), whose sum is σ = 44604432000. Its totient is φ = 5554967040.

The previous prime is 19478411749. The next prime is 19478411779. The reversal of 19478411778 is 87711487491.

It is a happy number.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (19478411779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 405903 + ... + 451346.

It is an arithmetic number, because the mean of its divisors is an integer number (1393888500).

Almost surely, 2^19478411778 is an apocalyptic number.

19478411778 is an abundant number, since it is smaller than the sum of its proper divisors (25126020222).

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

19478411778 is a wasteful number, since it uses less digits than its factorization.

19478411778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 857802.

The product of its digits is 3161088, while the sum is 57.

The spelling of 19478411778 in words is "nineteen billion, four hundred seventy-eight million, four hundred eleven thousand, seven hundred seventy-eight".