1066645291 has 2 divisors, whose sum is σ = 1066645292. Its totient is φ = 1066645290.

The previous prime is 1066645277. The next prime is 1066645369. The reversal of 1066645291 is 1925466601.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1066645291 - 2¹¹ = 1066643243 is a prime.

It is a super-2 number, since 2×1066645291² = 2275464353624949362, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1066645091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 533322645 + 533322646.

It is an arithmetic number, because the mean of its divisors is an integer number (533322646).

Almost surely, 2^1066645291 is an apocalyptic number.

1066645291 is a deficient number, since it is larger than the sum of its proper divisors (1).

1066645291 is an equidigital number, since it uses as much as digits as its factorization.

1066645291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 1066645291 is about 32659.5359887430. The cubic root of 1066645291 is about 1021.7390846562.

The spelling of 1066645291 in words is "one billion, sixty-six million, six hundred forty-five thousand, two hundred ninety-one".