19479477878 has 16 divisors (see below), whose sum is σ = 33959381760. Its totient is φ = 8206849896.

The previous prime is 19479477833. The next prime is 19479477917. The reversal of 19479477878 is 87877497491.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11790626 + ... + 11792277.

It is an arithmetic number, because the mean of its divisors is an integer number (2122461360).

Almost surely, 2^19479477878 is an apocalyptic number.

19479477878 is a deficient number, since it is larger than the sum of its proper divisors (14479903882).

19479477878 is a wasteful number, since it uses less digits than its factorization.

19479477878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23582971.

The product of its digits is 199148544, while the sum is 71.

The spelling of 19479477878 in words is "nineteen billion, four hundred seventy-nine million, four hundred seventy-seven thousand, eight hundred seventy-eight".