55521301440 has 224 divisors, whose sum is σ = 202427677440. Its totient is φ = 12751257600.

The previous prime is 55521301417. The next prime is 55521301481. The reversal of 55521301440 is 4410312555.

It is a super-2 number, since 2×55521301440² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 55521301398 and 55521301407.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 62280 + ... + 339000.

Almost surely, 2^55521301440 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 55521301440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101213838720).

55521301440 is an abundant number, since it is smaller than the sum of its proper divisors (146906376000).

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

55521301440 is a wasteful number, since it uses less digits than its factorization.

55521301440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276771 (or 276761 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

Adding to 55521301440 its reverse (4410312555), we get a palindrome (59931613995).

The spelling of 55521301440 in words is "fifty-five billion, five hundred twenty-one million, three hundred one thousand, four hundred forty".