55388745720 has 384 divisors, whose sum is σ = 224886205440. Its totient is φ = 11486085120.

The previous prime is 55388745719. The next prime is 55388745733. The reversal of 55388745720 is 2754788355.

55388745720 is a `hidden beast` number, since 5 + 538 + 87 + 4 + 5 + 7 + 20 = 666.

It is a hoax number, since the sum of its digits (54) 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 95 ways as a sum of consecutive naturals, for example, 15992709 + ... + 15996171.

It is an arithmetic number, because the mean of its divisors is an integer number (585641160).

Almost surely, 2^55388745720 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 55388745720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112443102720).

55388745720 is an abundant number, since it is smaller than the sum of its proper divisors (169497459720).

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

55388745720 is a wasteful number, since it uses less digits than its factorization.

55388745720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4075 (or 4068 counting only the distinct ones).

The product of its (nonzero) digits is 9408000, while the sum is 54.

It can be divided in two parts, 55388 and 745720, that added together give a palindrome (801108).

The spelling of 55388745720 in words is "fifty-five billion, three hundred eighty-eight million, seven hundred forty-five thousand, seven hundred twenty".