1266584749 has 2 divisors, whose sum is σ = 1266584750. Its totient is φ = 1266584748.

The previous prime is 1266584659. The next prime is 1266584903. The reversal of 1266584749 is 9474856621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1241152900 + 25431849 = 35230^2 + 5043^2 .

It is an emirp because it is prime and its reverse (9474856621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1266584749 - 2¹³ = 1266576557 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1266584696 and 1266584705.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1266584149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633292374 + 633292375.

It is an arithmetic number, because the mean of its divisors is an integer number (633292375).

Almost surely, 2^1266584749 is an apocalyptic number.

It is an amenable number.

1266584749 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266584749 is an equidigital number, since it uses as much as digits as its factorization.

1266584749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2903040, while the sum is 52.

The square root of 1266584749 is about 35589.1099776322. The cubic root of 1266584749 is about 1081.9605303907.

The spelling of 1266584749 in words is "one billion, two hundred sixty-six million, five hundred eighty-four thousand, seven hundred forty-nine".