1066649680 has 20 divisors (see below), whose sum is σ = 2479960692. Its totient is φ = 426659840.

The previous prime is 1066649659. The next prime is 1066649681. The reversal of 1066649680 is 869466601.

1066649680 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 781985296 + 284664384 = 27964^2 + 16872^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×1066649680² = 2275483079688204800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1066649680.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1066649681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6666481 + ... + 6666640.

Almost surely, 2^1066649680 is an apocalyptic number.

1066649680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1066649680 is an abundant number, since it is smaller than the sum of its proper divisors (1413311012).

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

1066649680 is a wasteful number, since it uses less digits than its factorization.

1066649680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13333134 (or 13333128 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 46.

The square root of 1066649680 is about 32659.6031819127. The cubic root of 1066649680 is about 1021.7404860614.

The spelling of 1066649680 in words is "one billion, sixty-six million, six hundred forty-nine thousand, six hundred eighty".