1066684649 has 2 divisors, whose sum is σ = 1066684650. Its totient is φ = 1066684648.

The previous prime is 1066684637. The next prime is 1066684651. The reversal of 1066684649 is 9464866601.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1057875625 + 8809024 = 32525^2 + 2968^2 .

It is an emirp because it is prime and its reverse (9464866601) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1066684649 - 2¹² = 1066680553 is a prime.

It is a super-2 number, since 2×1066684649² = 2275632280824506402, which contains 22 as substring.

Together with 1066684651, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1066684597 and 1066684606.

It is not a weakly prime, because it can be changed into another prime (1066684609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 533342324 + 533342325.

It is an arithmetic number, because the mean of its divisors is an integer number (533342325).

Almost surely, 2^1066684649 is an apocalyptic number.

It is an amenable number.

1066684649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1066684649 is an equidigital number, since it uses as much as digits as its factorization.

1066684649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1492992, while the sum is 50.

The square root of 1066684649 is about 32660.1385330804. The cubic root of 1066684649 is about 1021.7516515057.

The spelling of 1066684649 in words is "one billion, sixty-six million, six hundred eighty-four thousand, six hundred forty-nine".