1066247509 has 2 divisors, whose sum is σ = 1066247510. Its totient is φ = 1066247508.

The previous prime is 1066247489. The next prime is 1066247519. The reversal of 1066247509 is 9057426601.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 943104100 + 123143409 = 30710^2 + 11097^2 .

It is a cyclic number.

It is not a de Polignac number, because 1066247509 - 2⁵ = 1066247477 is a prime.

It is a super-2 number, since 2×1066247509² = 2273767500897410162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1066247519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 533123754 + 533123755.

It is an arithmetic number, because the mean of its divisors is an integer number (533123755).

Almost surely, 2^1066247509 is an apocalyptic number.

It is an amenable number.

1066247509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1066247509 is an equidigital number, since it uses as much as digits as its factorization.

1066247509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 1066247509 is about 32653.4455915452. The cubic root of 1066247509 is about 1021.6120571263.

The spelling of 1066247509 in words is "one billion, sixty-six million, two hundred forty-seven thousand, five hundred nine".