11666259309 has 16 divisors (see below), whose sum is σ = 15664469184. Its totient is φ = 7722864000.

The previous prime is 11666259289. The next prime is 11666259313. The reversal of 11666259309 is 90395266611.

It is a happy number.

It is not a de Polignac number, because 11666259309 - 2⁵ = 11666259277 is a prime.

It is a super-2 number, since 2×11666259309² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11666259379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 567409 + ... + 587609.

It is an arithmetic number, because the mean of its divisors is an integer number (979029324).

Almost surely, 2^11666259309 is an apocalyptic number.

It is an amenable number.

11666259309 is a deficient number, since it is larger than the sum of its proper divisors (3998209875).

11666259309 is a wasteful number, since it uses less digits than its factorization.

11666259309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21548.

The product of its (nonzero) digits is 524880, while the sum is 48.

The spelling of 11666259309 in words is "eleven billion, six hundred sixty-six million, two hundred fifty-nine thousand, three hundred nine".