1066645404 has 144 divisors (see below), whose sum is σ = 3062797920. Its totient is φ = 310033920.

The previous prime is 1066645403. The next prime is 1066645409. The reversal of 1066645404 is 4045466601.

It is a super-2 number, since 2×1066645404² = 2275464835748646432, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1066645403) 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, 3364654 + ... + 3364970.

It is an arithmetic number, because the mean of its divisors is an integer number (21269430).

Almost surely, 2^1066645404 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 1066645404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1531398960).

1066645404 is an abundant number, since it is smaller than the sum of its proper divisors (1996152516).

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

1066645404 is a wasteful number, since it uses less digits than its factorization.

1066645404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660 (or 655 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 1066645404 is about 32659.5377187124. The cubic root of 1066645404 is about 1021.7391207371.

The spelling of 1066645404 in words is "one billion, sixty-six million, six hundred forty-five thousand, four hundred four".