1266539385 has 8 divisors (see below), whose sum is σ = 2026463040. Its totient is φ = 675487664.

The previous prime is 1266539383. The next prime is 1266539399. The reversal of 1266539385 is 5839356621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1266539385 - 2¹ = 1266539383 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1266539383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42217965 + ... + 42217994.

It is an arithmetic number, because the mean of its divisors is an integer number (253307880).

Almost surely, 2^1266539385 is an apocalyptic number.

1266539385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1266539385 is a deficient number, since it is larger than the sum of its proper divisors (759923655).

1266539385 is an equidigital number, since it uses as much as digits as its factorization.

1266539385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84435967.

The product of its digits is 1166400, while the sum is 48.

The square root of 1266539385 is about 35588.4726421351. The cubic root of 1266539385 is about 1081.9476130702.

The spelling of 1266539385 in words is "one billion, two hundred sixty-six million, five hundred thirty-nine thousand, three hundred eighty-five".