19120380857 has 2 divisors, whose sum is σ = 19120380858. Its totient is φ = 19120380856.

The previous prime is 19120380847. The next prime is 19120380863. The reversal of 19120380857 is 75808302191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16700134441 + 2420246416 = 129229^2 + 49196^2 .

It is a cyclic number.

It is not a de Polignac number, because 19120380857 - 2²² = 19116186553 is a prime.

It is not a weakly prime, because it can be changed into another prime (19120380847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9560190428 + 9560190429.

It is an arithmetic number, because the mean of its divisors is an integer number (9560190429).

Almost surely, 2^19120380857 is an apocalyptic number.

It is an amenable number.

19120380857 is a deficient number, since it is larger than the sum of its proper divisors (1).

19120380857 is an equidigital number, since it uses as much as digits as its factorization.

19120380857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 44.

The spelling of 19120380857 in words is "nineteen billion, one hundred twenty million, three hundred eighty thousand, eight hundred fifty-seven".