1266146009 has 4 divisors (see below), whose sum is σ = 1340625204. Its totient is φ = 1191666816.

The previous prime is 1266145961. The next prime is 1266146017. The reversal of 1266146009 is 9006416621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 804970384 + 461175625 = 28372^2 + 21475^2 .

It is not a de Polignac number, because 1266146009 - 2²⁰ = 1265097433 is a prime.

It is a super-2 number, since 2×1266146009² = 3206251432213256162, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1266146009.

It is not an unprimeable number, because it can be changed into a prime (1266146039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37239572 + ... + 37239605.

It is an arithmetic number, because the mean of its divisors is an integer number (335156301).

Almost surely, 2^1266146009 is an apocalyptic number.

It is an amenable number.

1266146009 is a deficient number, since it is larger than the sum of its proper divisors (74479195).

1266146009 is an equidigital number, since it uses as much as digits as its factorization.

1266146009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74479194.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 1266146009 is about 35582.9454795412. The cubic root of 1266146009 is about 1081.8355869985.

The spelling of 1266146009 in words is "one billion, two hundred sixty-six million, one hundred forty-six thousand, nine".