55111800540 has 192 divisors, whose sum is σ = 169939123200. Its totient is φ = 13288181760.

The previous prime is 55111800521. The next prime is 55111800581. The reversal of 55111800540 is 4500811155.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 55111800498 and 55111800507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2665161 + ... + 2685759.

It is an arithmetic number, because the mean of its divisors is an integer number (885099600).

Almost surely, 2^55111800540 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 55111800540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84969561600).

55111800540 is an abundant number, since it is smaller than the sum of its proper divisors (114827322660).

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

55111800540 is a wasteful number, since it uses less digits than its factorization.

55111800540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20732 (or 20730 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 30.

The spelling of 55111800540 in words is "fifty-five billion, one hundred eleven million, eight hundred thousand, five hundred forty".