55015395820 has 192 divisors, whose sum is σ = 147837312000. Its totient is φ = 17047672320.

The previous prime is 55015395817. The next prime is 55015395829. The reversal of 55015395820 is 2859351055.

It is not an unprimeable number, because it can be changed into a prime (55015395829) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 13505304 + ... + 13509376.

It is an arithmetic number, because the mean of its divisors is an integer number (769986000).

Almost surely, 2^55015395820 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 55015395820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73918656000).

55015395820 is an abundant number, since it is smaller than the sum of its proper divisors (92821916180).

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

55015395820 is a wasteful number, since it uses less digits than its factorization.

55015395820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4293 (or 4277 counting only the distinct ones).

The product of its (nonzero) digits is 270000, while the sum is 43.

The spelling of 55015395820 in words is "fifty-five billion, fifteen million, three hundred ninety-five thousand, eight hundred twenty".