19719123044 has 6 divisors (see below), whose sum is σ = 34508465334. Its totient is φ = 9859561520.

The previous prime is 19719123043. The next prime is 19719123133. The reversal of 19719123044 is 44032191791.

It can be written as a sum of positive squares in only one way, i.e., 19454670400 + 264452644 = 139480^2 + 16262^2 .

It is a junction number, because it is equal to n+sod(n) for n = 19719122992 and 19719123010.

It is not an unprimeable number, because it can be changed into a prime (19719123041) by changing a digit.

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, 2464890377 + ... + 2464890384.

It is an arithmetic number, because the mean of its divisors is an integer number (5751410889).

Almost surely, 2^19719123044 is an apocalyptic number.

It is an amenable number.

19719123044 is a deficient number, since it is larger than the sum of its proper divisors (14789342290).

19719123044 is a wasteful number, since it uses less digits than its factorization.

19719123044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4929780765 (or 4929780763 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 41.

The spelling of 19719123044 in words is "nineteen billion, seven hundred nineteen million, one hundred twenty-three thousand, forty-four".