666622110 has 128 divisors (see below), whose sum is σ = 2081562624. Its totient is φ = 132485760.

The previous prime is 666622069. The next prime is 666622123. The reversal of 666622110 is 11226666.

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

It is a Curzon number.

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 46857 + ... + 59403.

It is an arithmetic number, because the mean of its divisors is an integer number (16262208).

Almost surely, 2^666622110 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666622110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1040781312).

666622110 is an abundant number, since it is smaller than the sum of its proper divisors (1414940514).

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

666622110 is a wasteful number, since it uses less digits than its factorization.

666622110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12598.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 666622110 is about 25819.0261241589. The cubic root of 666622110 is about 873.5610023859.

Adding to 666622110 its reverse (11226666), we get a palindrome (677848776).

The spelling of 666622110 in words is "six hundred sixty-six million, six hundred twenty-two thousand, one hundred ten".