19105999156 has 6 divisors (see below), whose sum is σ = 33435498530. Its totient is φ = 9552999576.

The previous prime is 19105999147. The next prime is 19105999169. The reversal of 19105999156 is 65199950191.

It can be written as a sum of positive squares in only one way, i.e., 9903434256 + 9202564900 = 99516^2 + 95930^2 .

It is a junction number, because it is equal to n+sod(n) for n = 19105999097 and 19105999106.

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, 2388249891 + ... + 2388249898.

Almost surely, 2^19105999156 is an apocalyptic number.

It is an amenable number.

19105999156 is a deficient number, since it is larger than the sum of its proper divisors (14329499374).

19105999156 is a wasteful number, since it uses less digits than its factorization.

19105999156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4776499793 (or 4776499791 counting only the distinct ones).

The product of its (nonzero) digits is 984150, while the sum is 55.

The spelling of 19105999156 in words is "nineteen billion, one hundred five million, nine hundred ninety-nine thousand, one hundred fifty-six".