11661505 has 8 divisors (see below), whose sum is σ = 14068224. Its totient is φ = 9279600.

The previous prime is 11661491. The next prime is 11661523. The reversal of 11661505 is 50516611.

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

It is not a de Polignac number, because 11661505 - 2⁹ = 11660993 is a prime.

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 11661505.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5151 + ... + 7060.

It is an arithmetic number, because the mean of its divisors is an integer number (1758528).

Almost surely, 2^11661505 is an apocalyptic number.

It is an amenable number.

11661505 is a deficient number, since it is larger than the sum of its proper divisors (2406719).

11661505 is a wasteful number, since it uses less digits than its factorization.

11661505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12407.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 11661505 is about 3414.8945810962. The cubic root of 11661505 is about 226.7696175449.

The spelling of 11661505 in words is "eleven million, six hundred sixty-one thousand, five hundred five".