19917478463 has 2 divisors, whose sum is σ = 19917478464. Its totient is φ = 19917478462.

The previous prime is 19917478411. The next prime is 19917478507. The reversal of 19917478463 is 36487471991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19917478463 - 2¹⁶ = 19917412927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19917471463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9958739231 + 9958739232.

It is an arithmetic number, because the mean of its divisors is an integer number (9958739232).

Almost surely, 2^19917478463 is an apocalyptic number.

19917478463 is a deficient number, since it is larger than the sum of its proper divisors (1).

19917478463 is an equidigital number, since it uses as much as digits as its factorization.

19917478463 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9144576, while the sum is 59.

The spelling of 19917478463 in words is "nineteen billion, nine hundred seventeen million, four hundred seventy-eight thousand, four hundred sixty-three".