55565511840 has 384 divisors, whose sum is σ = 206393080320. Its totient is φ = 13913800704.

The previous prime is 55565511821. The next prime is 55565511871. The reversal of 55565511840 is 4811556555.

55565511840 is a `hidden beast` number, since 5 + 5 + 56 + 5 + 511 + 84 + 0 = 666.

It is a super-2 number, since 2×55565511840² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 62643877 + ... + 62644763.

It is an arithmetic number, because the mean of its divisors is an integer number (537481980).

Almost surely, 2^55565511840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55565511840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103196540160).

55565511840 is an abundant number, since it is smaller than the sum of its proper divisors (150827568480).

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

55565511840 is a wasteful number, since it uses less digits than its factorization.

55565511840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1781 (or 1767 counting only the distinct ones).

The product of its (nonzero) digits is 600000, while the sum is 45.

The spelling of 55565511840 in words is "fifty-five billion, five hundred sixty-five million, five hundred eleven thousand, eight hundred forty".