1266789851 has 2 divisors, whose sum is σ = 1266789852. Its totient is φ = 1266789850.

The previous prime is 1266789841. The next prime is 1266789863. The reversal of 1266789851 is 1589876621.

It is a weak prime.

It is an emirp because it is prime and its reverse (1589876621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1266789851 - 2²² = 1262595547 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 1266789793 and 1266789802.

It is not a weakly prime, because it can be changed into another prime (1266789841) 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, 633394925 + 633394926.

It is an arithmetic number, because the mean of its divisors is an integer number (633394926).

Almost surely, 2^1266789851 is an apocalyptic number.

1266789851 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266789851 is an equidigital number, since it uses as much as digits as its factorization.

1266789851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1451520, while the sum is 53.

The square root of 1266789851 is about 35591.9913885132. The cubic root of 1266789851 is about 1082.0189289810.

The spelling of 1266789851 in words is "one billion, two hundred sixty-six million, seven hundred eighty-nine thousand, eight hundred fifty-one".