19917478426 has 16 divisors (see below), whose sum is σ = 31647597696. Its totient is φ = 9368796096.

The previous prime is 19917478411. The next prime is 19917478463. The reversal of 19917478426 is 62487471991.

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, 50316 + ... + 205831.

It is an arithmetic number, because the mean of its divisors is an integer number (1977974856).

Almost surely, 2^19917478426 is an apocalyptic number.

19917478426 is a deficient number, since it is larger than the sum of its proper divisors (11730119270).

19917478426 is a wasteful number, since it uses less digits than its factorization.

19917478426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258453.

The product of its digits is 6096384, while the sum is 58.

The spelling of 19917478426 in words is "nineteen billion, nine hundred seventeen million, four hundred seventy-eight thousand, four hundred twenty-six".