19780110871 has 2 divisors, whose sum is σ = 19780110872. Its totient is φ = 19780110870.

The previous prime is 19780110859. The next prime is 19780110919. The reversal of 19780110871 is 17801108791.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19780110871 - 2⁵ = 19780110839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19780110841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9890055435 + 9890055436.

It is an arithmetic number, because the mean of its divisors is an integer number (9890055436).

Almost surely, 2^19780110871 is an apocalyptic number.

19780110871 is a deficient number, since it is larger than the sum of its proper divisors (1).

19780110871 is an equidigital number, since it uses as much as digits as its factorization.

19780110871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 43.

The spelling of 19780110871 in words is "nineteen billion, seven hundred eighty million, one hundred ten thousand, eight hundred seventy-one".