11666505 has 16 divisors (see below), whose sum is σ = 19764864. Its totient is φ = 5856000.

The previous prime is 11666491. The next prime is 11666521. The reversal of 11666505 is 50566611.

It is not a de Polignac number, because 11666505 - 2¹⁰ = 11665481 is a prime.

It is a super-2 number, since 2×11666505² = 272214677830050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22621 + ... + 23130.

It is an arithmetic number, because the mean of its divisors is an integer number (1235304).

Almost surely, 2^11666505 is an apocalyptic number.

11666505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11666505 is a deficient number, since it is larger than the sum of its proper divisors (8098359).

11666505 is a wasteful number, since it uses less digits than its factorization.

11666505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45776.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 11666505 is about 3415.6265896611. The cubic root of 11666505 is about 226.8020229128.

The spelling of 11666505 in words is "eleven million, six hundred sixty-six thousand, five hundred five".