11516661 has 20 divisors (see below), whose sum is σ = 18528972. Its totient is φ = 7086528.

The previous prime is 11516581. The next prime is 11516663. The reversal of 11516661 is 16661511.

It can be written as a sum of positive squares in 2 ways, for example, as 6812100 + 4704561 = 2610^2 + 2169^2 .

It is not a de Polignac number, because 11516661 - 2¹⁴ = 11500277 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11516663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4416 + ... + 6521.

Almost surely, 2^11516661 is an apocalyptic number.

It is an amenable number.

11516661 is a deficient number, since it is larger than the sum of its proper divisors (7012311).

11516661 is a wasteful number, since it uses less digits than its factorization.

11516661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10962 (or 10953 counting only the distinct ones).

The product of its digits is 1080, while the sum is 27.

The square root of 11516661 is about 3393.6206328934. The cubic root of 11516661 is about 225.8268245500.

The spelling of 11516661 in words is "eleven million, five hundred sixteen thousand, six hundred sixty-one".