1266646149 has 24 divisors (see below), whose sum is σ = 1945000512. Its totient is φ = 791568000.

The previous prime is 1266646111. The next prime is 1266646187. The reversal of 1266646149 is 9416466621.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1266646111) and next prime (1266646187).

It is not a de Polignac number, because 1266646149 - 2²⁰ = 1265597573 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266647149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21912 + ... + 54894.

It is an arithmetic number, because the mean of its divisors is an integer number (81041688).

Almost surely, 2^1266646149 is an apocalyptic number.

It is an amenable number.

1266646149 is a deficient number, since it is larger than the sum of its proper divisors (678354363).

1266646149 is a wasteful number, since it uses less digits than its factorization.

1266646149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33257 (or 33254 counting only the distinct ones).

The product of its digits is 373248, while the sum is 45.

The square root of 1266646149 is about 35589.9725906048. The cubic root of 1266646149 is about 1081.9780134432.

The spelling of 1266646149 in words is "one billion, two hundred sixty-six million, six hundred forty-six thousand, one hundred forty-nine".