55428111648 has 864 divisors, whose sum is σ = 208606648320. Its totient is φ = 14265538560.

The previous prime is 55428111647. The next prime is 55428111649. The reversal of 55428111648 is 84611182455.

55428111648 is a `hidden beast` number, since 55 + 428 + 11 + 164 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (55428111647) and next prime (55428111649).

It is a tau number, because it is divible by the number of its divisors (864).

It is not an unprimeable number, because it can be changed into a prime (55428111643) 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 143 ways as a sum of consecutive naturals, for example, 436441761 + ... + 436441887.

It is an arithmetic number, because the mean of its divisors is an integer number (241442880).

Almost surely, 2^55428111648 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 55428111648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104303324160).

55428111648 is an abundant number, since it is smaller than the sum of its proper divisors (153178536672).

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

55428111648 is a wasteful number, since it uses less digits than its factorization.

55428111648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247 (or 213 counting only the distinct ones).

The product of its digits is 307200, while the sum is 45.

The spelling of 55428111648 in words is "fifty-five billion, four hundred twenty-eight million, one hundred eleven thousand, six hundred forty-eight".