1166661 has 6 divisors (see below), whose sum is σ = 1685190. Its totient is φ = 777768.

The previous prime is 1166639. The next prime is 1166663. The reversal of 1166661 is 1666611.

It can be written as a sum of positive squares in only one way, i.e., 690561 + 476100 = 831^2 + 690^2 .

It is not a de Polignac number, because 1166661 - 2⁶ = 1166597 is a prime.

It is a super-2 number, since 2×1166661² = 2722195777842, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1166663) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 64806 + ... + 64823.

It is an arithmetic number, because the mean of its divisors is an integer number (280865).

2^1166661 is an apocalyptic number.

It is an amenable number.

1166661 is a deficient number, since it is larger than the sum of its proper divisors (518529).

1166661 is a wasteful number, since it uses less digits than its factorization.

1166661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129635 (or 129632 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 1166661 is about 1080.1208265745. The cubic root of 1166661 is about 105.2724895192.

The spelling of 1166661 in words is "one million, one hundred sixty-six thousand, six hundred sixty-one".