11666456415 has 12 divisors (see below), whose sum is σ = 20221857864. Its totient is φ = 6222110064.

The previous prime is 11666456413. The next prime is 11666456441. The reversal of 11666456415 is 51465466611.

It is not a de Polignac number, because 11666456415 - 2¹ = 11666456413 is a prime.

It is a super-2 number, since 2×11666456415² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 259254587 = 11666456415 / (1 + 1 + 6 + 6 + 6 + 4 + 5 + 6 + 4 + 1 + 5).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11666456413) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 129627249 + ... + 129627338.

It is an arithmetic number, because the mean of its divisors is an integer number (1685154822).

Almost surely, 2^11666456415 is an apocalyptic number.

11666456415 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

11666456415 is a deficient number, since it is larger than the sum of its proper divisors (8555401449).

11666456415 is a wasteful number, since it uses less digits than its factorization.

11666456415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259254598 (or 259254595 counting only the distinct ones).

The product of its digits is 518400, while the sum is 45.

The spelling of 11666456415 in words is "eleven billion, six hundred sixty-six million, four hundred fifty-six thousand, four hundred fifteen".