55420440320 has 144 divisors (see below), whose sum is σ = 159698864640. Its totient is φ = 18001170432.

The previous prime is 55420440293. The next prime is 55420440359. The reversal of 55420440320 is 2304402455.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7469 + ... + 333011.

Almost surely, 2^55420440320 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 55420440320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79849432320).

55420440320 is an abundant number, since it is smaller than the sum of its proper divisors (104278424320).

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

55420440320 is a wasteful number, since it uses less digits than its factorization.

55420440320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325590 (or 325576 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 29.

Adding to 55420440320 its reverse (2304402455), we get a palindrome (57724842775).

The spelling of 55420440320 in words is "fifty-five billion, four hundred twenty million, four hundred forty thousand, three hundred twenty".