19109309556 has 24 divisors (see below), whose sum is σ = 44733636640. Its totient is φ = 6349020192.

The previous prime is 19109309467. The next prime is 19109309563. The reversal of 19109309556 is 65590390191.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

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, 2589871 + ... + 2597238.

Almost surely, 2^19109309556 is an apocalyptic number.

It is an amenable number.

19109309556 is an abundant number, since it is smaller than the sum of its proper divisors (25624327084).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19109309556 is a wasteful number, since it uses less digits than its factorization.

19109309556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5187423 (or 5187421 counting only the distinct ones).

The product of its (nonzero) digits is 328050, while the sum is 48.

The spelling of 19109309556 in words is "nineteen billion, one hundred nine million, three hundred nine thousand, five hundred fifty-six".