19917478425 has 48 divisors (see below), whose sum is σ = 35548294208. Its totient is φ = 9782035200.

The previous prime is 19917478411. The next prime is 19917478463. The reversal of 19917478425 is 52487471991.

It is not a de Polignac number, because 19917478425 - 2⁷ = 19917478297 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 386214 + ... + 434736.

Almost surely, 2^19917478425 is an apocalyptic number.

19917478425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19917478425 is a deficient number, since it is larger than the sum of its proper divisors (15630815783).

19917478425 is a wasteful number, since it uses less digits than its factorization.

19917478425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48970 (or 48965 counting only the distinct ones).

The product of its digits is 5080320, while the sum is 57.

The spelling of 19917478425 in words is "nineteen billion, nine hundred seventeen million, four hundred seventy-eight thousand, four hundred twenty-five".