55388442816 has 840 divisors, whose sum is σ = 202232178720. Its totient is φ = 14923948032.

The previous prime is 55388442793. The next prime is 55388442937. The reversal of 55388442816 is 61824488355.

55388442816 is a `hidden beast` number, since 5 + 538 + 84 + 4 + 28 + 1 + 6 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 537751821 + ... + 537751923.

Almost surely, 2^55388442816 is an apocalyptic number.

55388442816 is a gapful number since it is divisible by the number (56) 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 55388442816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101116089360).

55388442816 is an abundant number, since it is smaller than the sum of its proper divisors (146843735904).

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

55388442816 is a wasteful number, since it uses less digits than its factorization.

55388442816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243 (or 217 counting only the distinct ones).

The product of its digits is 7372800, while the sum is 54.

The spelling of 55388442816 in words is "fifty-five billion, three hundred eighty-eight million, four hundred forty-two thousand, eight hundred sixteen".