1066639489 has 2 divisors, whose sum is σ = 1066639490. Its totient is φ = 1066639488.

The previous prime is 1066639481. The next prime is 1066639523. The reversal of 1066639489 is 9849366601.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 971381889 + 95257600 = 31167^2 + 9760^2 .

It is an emirp because it is prime and its reverse (9849366601) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1066639489 - 2³ = 1066639481 is a prime.

It is a super-2 number, since 2×1066639489² = 2275439598988362242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1066639481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 533319744 + 533319745.

It is an arithmetic number, because the mean of its divisors is an integer number (533319745).

Almost surely, 2^1066639489 is an apocalyptic number.

It is an amenable number.

1066639489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1066639489 is an equidigital number, since it uses as much as digits as its factorization.

1066639489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1679616, while the sum is 52.

The square root of 1066639489 is about 32659.4471631104. The cubic root of 1066639489 is about 1021.7372320751.

The spelling of 1066639489 in words is "one billion, sixty-six million, six hundred thirty-nine thousand, four hundred eighty-nine".