66110055400 has 192 divisors, whose sum is σ = 165161304000. Its totient is φ = 24534835200.

The previous prime is 66110055397. The next prime is 66110055409. The reversal of 66110055400 is 455001166.

It is not an unprimeable number, because it can be changed into a prime (66110055409) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 71162136 + ... + 71163064.

It is an arithmetic number, because the mean of its divisors is an integer number (860215125).

Almost surely, 2^66110055400 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 66110055400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82580652000).

66110055400 is an abundant number, since it is smaller than the sum of its proper divisors (99051248600).

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

66110055400 is a wasteful number, since it uses less digits than its factorization.

66110055400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1332 (or 1323 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

Adding to 66110055400 its reverse (455001166), we get a palindrome (66565056566).

The spelling of 66110055400 in words is "sixty-six billion, one hundred ten million, fifty-five thousand, four hundred".