19545081944 has 8 divisors (see below), whose sum is σ = 36647028660. Its totient is φ = 9772540968.

The previous prime is 19545081901. The next prime is 19545081953. The reversal of 19545081944 is 44918054591.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 19545081892 and 19545081901.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1221567614 + ... + 1221567629.

Almost surely, 2^19545081944 is an apocalyptic number.

It is an amenable number.

19545081944 is a deficient number, since it is larger than the sum of its proper divisors (17101946716).

19545081944 is a wasteful number, since it uses less digits than its factorization.

19545081944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2443135249 (or 2443135245 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 50.

The spelling of 19545081944 in words is "nineteen billion, five hundred forty-five million, eighty-one thousand, nine hundred forty-four".