19158719161 has 2 divisors, whose sum is σ = 19158719162. Its totient is φ = 19158719160.

The previous prime is 19158719119. The next prime is 19158719171. The reversal of 19158719161 is 16191785191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18928256400 + 230462761 = 137580^2 + 15181^2 .

It is a cyclic number.

It is not a de Polignac number, because 19158719161 - 2¹⁹ = 19158194873 is a prime.

It is not a weakly prime, because it can be changed into another prime (19158719171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9579359580 + 9579359581.

It is an arithmetic number, because the mean of its divisors is an integer number (9579359581).

Almost surely, 2^19158719161 is an apocalyptic number.

It is an amenable number.

19158719161 is a deficient number, since it is larger than the sum of its proper divisors (1).

19158719161 is an equidigital number, since it uses as much as digits as its factorization.

19158719161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 49.

The spelling of 19158719161 in words is "nineteen billion, one hundred fifty-eight million, seven hundred nineteen thousand, one hundred sixty-one".