55105665500 has 144 divisors (see below), whose sum is σ = 126707677824. Its totient is φ = 20933827200.

The previous prime is 55105665491. The next prime is 55105665551. The reversal of 55105665500 is 556650155.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 41525837 + ... + 41527163.

Almost surely, 2^55105665500 is an apocalyptic number.

55105665500 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 55105665500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63353838912).

55105665500 is an abundant number, since it is smaller than the sum of its proper divisors (71602012324).

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

55105665500 is a wasteful number, since it uses less digits than its factorization.

55105665500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1549 (or 1514 counting only the distinct ones).

The product of its (nonzero) digits is 112500, while the sum is 38.

The spelling of 55105665500 in words is "fifty-five billion, one hundred five million, six hundred sixty-five thousand, five hundred".