55051320636 has 144 divisors (see below), whose sum is σ = 151695180000. Its totient is φ = 16732348416.

The previous prime is 55051320607. The next prime is 55051320671. The reversal of 55051320636 is 63602315055.

55051320636 is a `hidden beast` number, since 5 + 5 + 0 + 5 + 13 + 2 + 0 + 636 = 666.

55051320636 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 55051320636.

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, 36724615 + ... + 36726113.

It is an arithmetic number, because the mean of its divisors is an integer number (1053438750).

Almost surely, 2^55051320636 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 55051320636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75847590000).

55051320636 is an abundant number, since it is smaller than the sum of its proper divisors (96643859364).

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

55051320636 is a wasteful number, since it uses less digits than its factorization.

55051320636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2428 (or 2423 counting only the distinct ones).

The product of its (nonzero) digits is 81000, while the sum is 36.

The spelling of 55051320636 in words is "fifty-five billion, fifty-one million, three hundred twenty thousand, six hundred thirty-six".