1066356689 has 4 divisors (see below), whose sum is σ = 1069043124. Its totient is φ = 1063670256.

The previous prime is 1066356649. The next prime is 1066356713. The reversal of 1066356689 is 9866536601.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 324720400 + 741636289 = 18020^2 + 27233^2 .

It is a cyclic number.

It is not a de Polignac number, because 1066356689 - 2¹² = 1066352593 is a prime.

It is a super-2 number, since 2×1066356689² = 2274233176350085442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1066356649) 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, 1342622 + ... + 1343415.

It is an arithmetic number, because the mean of its divisors is an integer number (267260781).

Almost surely, 2^1066356689 is an apocalyptic number.

It is an amenable number.

1066356689 is a deficient number, since it is larger than the sum of its proper divisors (2686435).

1066356689 is an equidigital number, since it uses as much as digits as its factorization.

1066356689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2686434.

The product of its (nonzero) digits is 1399680, while the sum is 50.

The square root of 1066356689 is about 32655.1173478216. The cubic root of 1066356689 is about 1021.6469257650.

The spelling of 1066356689 in words is "one billion, sixty-six million, three hundred fifty-six thousand, six hundred eighty-nine".