19455555456 has 128 divisors (see below), whose sum is σ = 58504874400. Its totient is φ = 6362763264.

The previous prime is 19455555439. The next prime is 19455555461. The reversal of 19455555456 is 65455555491.

19455555456 is a `hidden beast` number, since 1 + 9 + 45 + 5 + 55 + 545 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130060 + ... + 236276.

Almost surely, 2^19455555456 is an apocalyptic number.

19455555456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19455555456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29252437200).

19455555456 is an abundant number, since it is smaller than the sum of its proper divisors (39049318944).

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

19455555456 is a wasteful number, since it uses less digits than its factorization.

19455555456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106293 (or 106275 counting only the distinct ones).

The product of its digits is 13500000, while the sum is 54.

The spelling of 19455555456 in words is "nineteen billion, four hundred fifty-five million, five hundred fifty-five thousand, four hundred fifty-six".