1100043666 has 40 divisors (see below), whose sum is σ = 2477496780. Its totient is φ = 364809312.

The previous prime is 1100043661. The next prime is 1100043671. The reversal of 1100043666 is 6663400011.

It is an interprime number because it is at equal distance from previous prime (1100043661) and next prime (1100043671).

It can be written as a sum of positive squares in 2 ways, for example, as 953512641 + 146531025 = 30879^2 + 12105^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1100043661) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 14680 + ... + 49148.

Almost surely, 2^1100043666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1100043666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1238748390).

1100043666 is an abundant number, since it is smaller than the sum of its proper divisors (1377453114).

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

1100043666 is a wasteful number, since it uses less digits than its factorization.

1100043666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34680 (or 34671 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 1100043666 is about 33166.9061867398. The cubic root of 1100043666 is about 1032.2937745312.

Adding to 1100043666 its reverse (6663400011), we get a palindrome (7763443677).

The spelling of 1100043666 in words is "one billion, one hundred million, forty-three thousand, six hundred sixty-six".