19155363961 has 2 divisors, whose sum is σ = 19155363962. Its totient is φ = 19155363960.

The previous prime is 19155363937. The next prime is 19155363967. The reversal of 19155363961 is 16936355191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18414490000 + 740873961 = 135700^2 + 27219^2 .

It is a cyclic number.

It is not a de Polignac number, because 19155363961 - 2¹⁵ = 19155331193 is a prime.

It is not a weakly prime, because it can be changed into another prime (19155363967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9577681980 + 9577681981.

It is an arithmetic number, because the mean of its divisors is an integer number (9577681981).

Almost surely, 2^19155363961 is an apocalyptic number.

It is an amenable number.

19155363961 is a deficient number, since it is larger than the sum of its proper divisors (1).

19155363961 is an equidigital number, since it uses as much as digits as its factorization.

19155363961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 656100, while the sum is 49.

The spelling of 19155363961 in words is "nineteen billion, one hundred fifty-five million, three hundred sixty-three thousand, nine hundred sixty-one".