55726128128 has 176 divisors, whose sum is σ = 133494531840. Its totient is φ = 22951526400.

The previous prime is 55726128079. The next prime is 55726128169. The reversal of 55726128128 is 82182162755.

It is a tau number, because it is divible by the number of its divisors (176).

It is a super-2 number, since 2×55726128128² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4916708 + ... + 4928028.

Almost surely, 2^55726128128 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 55726128128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66747265920).

55726128128 is an abundant number, since it is smaller than the sum of its proper divisors (77768403712).

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

55726128128 is a wasteful number, since it uses less digits than its factorization.

55726128128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11394 (or 11376 counting only the distinct ones).

The product of its digits is 537600, while the sum is 47.

The spelling of 55726128128 in words is "fifty-five billion, seven hundred twenty-six million, one hundred twenty-eight thousand, one hundred twenty-eight".