11661611 has 16 divisors (see below), whose sum is σ = 13655040. Its totient is φ = 9862560.

The previous prime is 11661607. The next prime is 11661613. The reversal of 11661611 is 11616611.

It is a cyclic number.

It is not a de Polignac number, because 11661611 - 2² = 11661607 is a prime.

It is a super-2 number, since 2×11661611² = 271986342230642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11661613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6896 + ... + 8418.

It is an arithmetic number, because the mean of its divisors is an integer number (853440).

Almost surely, 2^11661611 is an apocalyptic number.

11661611 is a deficient number, since it is larger than the sum of its proper divisors (1993429).

11661611 is a wasteful number, since it uses less digits than its factorization.

11661611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1586.

The product of its digits is 216, while the sum is 23.

The square root of 11661611 is about 3414.9101013057. The cubic root of 11661611 is about 226.7703046348.

The spelling of 11661611 in words is "eleven million, six hundred sixty-one thousand, six hundred eleven".