55421353540 has 192 divisors, whose sum is σ = 145252445184. Its totient is φ = 17327112192.

The previous prime is 55421353513. The next prime is 55421353543. The reversal of 55421353540 is 4535312455.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a self number, because there is not a number n which added to its sum of digits gives 55421353540.

It is not an unprimeable number, because it can be changed into a prime (55421353543) 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, 23158584 + ... + 23160976.

It is an arithmetic number, because the mean of its divisors is an integer number (756523152).

Almost surely, 2^55421353540 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 55421353540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72626222592).

55421353540 is an abundant number, since it is smaller than the sum of its proper divisors (89831091644).

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

55421353540 is a wasteful number, since it uses less digits than its factorization.

55421353540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2726 (or 2724 counting only the distinct ones).

The product of its (nonzero) digits is 180000, while the sum is 37.

Adding to 55421353540 its reverse (4535312455), we get a palindrome (59956665995).

It can be divided in two parts, 554213 and 53540, that added together give a triangular number (607753 = T₁₁₀₂).

The spelling of 55421353540 in words is "fifty-five billion, four hundred twenty-one million, three hundred fifty-three thousand, five hundred forty".