19783226801857 has 2 divisors, whose sum is σ = 19783226801858. Its totient is φ = 19783226801856.

The previous prime is 19783226801801. The next prime is 19783226801929. The reversal of 19783226801857 is 75810862238791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19350136456641 + 433090345216 = 4398879^2 + 658096^2 .

It is a cyclic number.

It is not a de Polignac number, because 19783226801857 - 2²³ = 19783218413249 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19783226801792 and 19783226801801.

It is not a weakly prime, because it can be changed into another prime (19783226807857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9891613400928 + 9891613400929.

It is an arithmetic number, because the mean of its divisors is an integer number (9891613400929).

Almost surely, 2^{19783226801857} is an apocalyptic number.

It is an amenable number.

19783226801857 is a deficient number, since it is larger than the sum of its proper divisors (1).

19783226801857 is an equidigital number, since it uses as much as digits as its factorization.

19783226801857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81285120, while the sum is 67.

The spelling of 19783226801857 in words is "nineteen trillion, seven hundred eighty-three billion, two hundred twenty-six million, eight hundred one thousand, eight hundred fifty-seven".