55023215544 has 128 divisors (see below), whose sum is σ = 166994784000. Its totient is φ = 16647926400.

The previous prime is 55023215519. The next prime is 55023215551. The reversal of 55023215544 is 44551232055.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 55023215499 and 55023215508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1548214 + ... + 1583354.

It is an arithmetic number, because the mean of its divisors is an integer number (1304646750).

Almost surely, 2^55023215544 is an apocalyptic number.

55023215544 is a gapful number since it is divisible by the number (54) 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 55023215544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83497392000).

55023215544 is an abundant number, since it is smaller than the sum of its proper divisors (111971568456).

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

55023215544 is a wasteful number, since it uses less digits than its factorization.

55023215544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35826 (or 35816 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 36.

Adding to 55023215544 its reverse (44551232055), we get a palindrome (99574447599).

The spelling of 55023215544 in words is "fifty-five billion, twenty-three million, two hundred fifteen thousand, five hundred forty-four".