19544377808 has 10 divisors (see below), whose sum is σ = 37867232034. Its totient is φ = 9772188896.

The previous prime is 19544377793. The next prime is 19544377841. The reversal of 19544377808 is 80877344591.

It can be written as a sum of positive squares in only one way, i.e., 17494823824 + 2049553984 = 132268^2 + 45272^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610761791 + ... + 610761822.

Almost surely, 2^19544377808 is an apocalyptic number.

It is an amenable number.

19544377808 is a deficient number, since it is larger than the sum of its proper divisors (18322854226).

19544377808 is a wasteful number, since it uses less digits than its factorization.

19544377808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1221523621 (or 1221523615 counting only the distinct ones).

The product of its (nonzero) digits is 6773760, while the sum is 56.

The spelling of 19544377808 in words is "nineteen billion, five hundred forty-four million, three hundred seventy-seven thousand, eight hundred eight".