19544377841 has 2 divisors, whose sum is σ = 19544377842. Its totient is φ = 19544377840.

The previous prime is 19544377793. The next prime is 19544377847. The reversal of 19544377841 is 14877344591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15461679025 + 4082698816 = 124345^2 + 63896^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19544377841 is a prime.

It is not a weakly prime, because it can be changed into another prime (19544377847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9772188920 + 9772188921.

It is an arithmetic number, because the mean of its divisors is an integer number (9772188921).

Almost surely, 2^19544377841 is an apocalyptic number.

It is an amenable number.

19544377841 is a deficient number, since it is larger than the sum of its proper divisors (1).

19544377841 is an equidigital number, since it uses as much as digits as its factorization.

19544377841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3386880, while the sum is 53.

The spelling of 19544377841 in words is "nineteen billion, five hundred forty-four million, three hundred seventy-seven thousand, eight hundred forty-one".