1066977581 has 2 divisors, whose sum is σ = 1066977582. Its totient is φ = 1066977580.

The previous prime is 1066977559. The next prime is 1066977589. The reversal of 1066977581 is 1857796601.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 550324681 + 516652900 = 23459^2 + 22730^2 .

It is a cyclic number.

It is not a de Polignac number, because 1066977581 - 2²² = 1062783277 is a prime.

It is a super-2 number, since 2×1066977581² = 2276882316713223122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1066977589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 533488790 + 533488791.

It is an arithmetic number, because the mean of its divisors is an integer number (533488791).

Almost surely, 2^1066977581 is an apocalyptic number.

It is an amenable number.

1066977581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1066977581 is an equidigital number, since it uses as much as digits as its factorization.

1066977581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 635040, while the sum is 50.

The square root of 1066977581 is about 32664.6227744941. The cubic root of 1066977581 is about 1021.8451737918.

The spelling of 1066977581 in words is "one billion, sixty-six million, nine hundred seventy-seven thousand, five hundred eighty-one".