19688942851 has 2 divisors, whose sum is σ = 19688942852. Its totient is φ = 19688942850.

The previous prime is 19688942849. The next prime is 19688942881. The reversal of 19688942851 is 15824988691.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19688942851 - 2¹ = 19688942849 is a prime.

Together with 19688942849, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 19688942851.

It is not a weakly prime, because it can be changed into another prime (19688942881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9844471425 + 9844471426.

It is an arithmetic number, because the mean of its divisors is an integer number (9844471426).

Almost surely, 2^19688942851 is an apocalyptic number.

19688942851 is a deficient number, since it is larger than the sum of its proper divisors (1).

19688942851 is an equidigital number, since it uses as much as digits as its factorization.

19688942851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9953280, while the sum is 61.

The spelling of 19688942851 in words is "nineteen billion, six hundred eighty-eight million, nine hundred forty-two thousand, eight hundred fifty-one".