19818123544 has 32 divisors (see below), whose sum is σ = 37617441120. Its totient is φ = 9787216896.

The previous prime is 19818123503. The next prime is 19818123583. The reversal of 19818123544 is 44532181891.

It is a junction number, because it is equal to n+sod(n) for n = 19818123494 and 19818123503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 364942 + ... + 415714.

It is an arithmetic number, because the mean of its divisors is an integer number (1175545035).

Almost surely, 2^19818123544 is an apocalyptic number.

It is an amenable number.

19818123544 is a deficient number, since it is larger than the sum of its proper divisors (17799317576).

19818123544 is a wasteful number, since it uses less digits than its factorization.

19818123544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51379 (or 51375 counting only the distinct ones).

The product of its digits is 276480, while the sum is 46.

The spelling of 19818123544 in words is "nineteen billion, eight hundred eighteen million, one hundred twenty-three thousand, five hundred forty-four".