19108125661 has 2 divisors, whose sum is σ = 19108125662. Its totient is φ = 19108125660.

The previous prime is 19108125601. The next prime is 19108125667. The reversal of 19108125661 is 16652180191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12674481561 + 6433644100 = 112581^2 + 80210^2 .

It is a cyclic number.

It is not a de Polignac number, because 19108125661 - 2¹⁵ = 19108092893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19108125667) 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, 9554062830 + 9554062831.

It is an arithmetic number, because the mean of its divisors is an integer number (9554062831).

Almost surely, 2^19108125661 is an apocalyptic number.

It is an amenable number.

19108125661 is a deficient number, since it is larger than the sum of its proper divisors (1).

19108125661 is an equidigital number, since it uses as much as digits as its factorization.

19108125661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 40.

The spelling of 19108125661 in words is "nineteen billion, one hundred eight million, one hundred twenty-five thousand, six hundred sixty-one".