55479720237840 has 480 divisors, whose sum is σ = 196423378849152. Its totient is φ = 14014909440000.

The previous prime is 55479720237829. The next prime is 55479720237859. The reversal of 55479720237840 is 4873202797455.

It is a happy number.

55479720237840 is a `hidden beast` number, since 5 + 5 + 479 + 72 + 0 + 23 + 78 + 4 + 0 = 666.

It is a Cunningham number, because it is equal to 7448471²-1.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 536238115 + ... + 536341565.

Almost surely, 2^{55479720237840} 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 55479720237840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98211689424576).

55479720237840 is an abundant number, since it is smaller than the sum of its proper divisors (140943658611312).

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

55479720237840 is a wasteful number, since it uses less digits than its factorization.

55479720237840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104039 (or 104030 counting only the distinct ones).

The product of its (nonzero) digits is 118540800, while the sum is 63.

The spelling of 55479720237840 in words is "fifty-five trillion, four hundred seventy-nine billion, seven hundred twenty million, two hundred thirty-seven thousand, eight hundred forty".