19544420856 has 32 divisors (see below), whose sum is σ = 48912704640. Its totient is φ = 6507919968.

The previous prime is 19544420839. The next prime is 19544420869. The reversal of 19544420856 is 65802444591.

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, 407236 + ... + 452691.

It is an arithmetic number, because the mean of its divisors is an integer number (1528522020).

Almost surely, 2^19544420856 is an apocalyptic number.

It is an amenable number.

19544420856 is an abundant number, since it is smaller than the sum of its proper divisors (29368283784).

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

19544420856 is a wasteful number, since it uses less digits than its factorization.

19544420856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860883 (or 860879 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 48.

The spelling of 19544420856 in words is "nineteen billion, five hundred forty-four million, four hundred twenty thousand, eight hundred fifty-six".