55030381440 has 512 divisors, whose sum is σ = 191731276800. Its totient is φ = 13382713344.

The previous prime is 55030381381. The next prime is 55030381447. The reversal of 55030381440 is 4418303055.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55030381447) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 124221859 + ... + 124222301.

It is an arithmetic number, because the mean of its divisors is an integer number (374475150).

Almost surely, 2^55030381440 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 55030381440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95865638400).

55030381440 is an abundant number, since it is smaller than the sum of its proper divisors (136700895360).

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

55030381440 is a wasteful number, since it uses less digits than its factorization.

55030381440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614 (or 602 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 33.

Adding to 55030381440 its reverse (4418303055), we get a palindrome (59448684495).

The spelling of 55030381440 in words is "fifty-five billion, thirty million, three hundred eighty-one thousand, four hundred forty".