1166406661 has 16 divisors (see below), whose sum is σ = 1362885120. Its totient is φ = 977437440.

The previous prime is 1166406653. The next prime is 1166406671. The reversal of 1166406661 is 1666046611.

It is not a de Polignac number, because 1166406661 - 2³ = 1166406653 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 1166406661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1166406641) 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, 488691 + ... + 491071.

It is an arithmetic number, because the mean of its divisors is an integer number (85180320).

Almost surely, 2^1166406661 is an apocalyptic number.

It is an amenable number.

1166406661 is a deficient number, since it is larger than the sum of its proper divisors (196478459).

1166406661 is a wasteful number, since it uses less digits than its factorization.

1166406661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3924.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 1166406661 is about 34152.6962478806. The cubic root of 1166406661 is about 1052.6483895473.

The spelling of 1166406661 in words is "one billion, one hundred sixty-six million, four hundred six thousand, six hundred sixty-one".