55509591000 has 128 divisors (see below), whose sum is σ = 173756943360. Its totient is φ = 14754096000.

The previous prime is 55509590993. The next prime is 55509591001. The reversal of 55509591000 is 19590555.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 55509591000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55509591001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 890865 + ... + 951135.

It is an arithmetic number, because the mean of its divisors is an integer number (1357476120).

Almost surely, 2^55509591000 is an apocalyptic number.

55509591000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55509591000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86878471680).

55509591000 is an abundant number, since it is smaller than the sum of its proper divisors (118247352360).

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

55509591000 is a wasteful number, since it uses less digits than its factorization.

55509591000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60602 (or 60588 counting only the distinct ones).

The product of its (nonzero) digits is 50625, while the sum is 39.

The spelling of 55509591000 in words is "fifty-five billion, five hundred nine million, five hundred ninety-one thousand".