11678661 has 20 divisors (see below), whose sum is σ = 18012544. Its totient is φ = 7533000.

The previous prime is 11678657. The next prime is 11678683. The reversal of 11678661 is 16687611.

11678661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11678661 - 2² = 11678657 is a prime.

It is a super-2 number, since 2×11678661² = 272782245505842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11678621) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 186 + ... + 4836.

Almost surely, 2^11678661 is an apocalyptic number.

It is an amenable number.

11678661 is a deficient number, since it is larger than the sum of its proper divisors (6333883).

11678661 is an equidigital number, since it uses as much as digits as its factorization.

11678661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4694 (or 4685 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 11678661 is about 3417.4055948921. The cubic root of 11678661 is about 226.8807682435.

The spelling of 11678661 in words is "eleven million, six hundred seventy-eight thousand, six hundred sixty-one".