19854634771 has 2 divisors, whose sum is σ = 19854634772. Its totient is φ = 19854634770.

The previous prime is 19854634699. The next prime is 19854634777. The reversal of 19854634771 is 17743645891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19854634771 - 2¹³ = 19854626579 is a prime.

It is not a weakly prime, because it can be changed into another prime (19854634777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9927317385 + 9927317386.

It is an arithmetic number, because the mean of its divisors is an integer number (9927317386).

Almost surely, 2^19854634771 is an apocalyptic number.

19854634771 is a deficient number, since it is larger than the sum of its proper divisors (1).

19854634771 is an equidigital number, since it uses as much as digits as its factorization.

19854634771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5080320, while the sum is 55.

The spelling of 19854634771 in words is "nineteen billion, eight hundred fifty-four million, six hundred thirty-four thousand, seven hundred seventy-one".