1161551666 has 16 divisors (see below), whose sum is σ = 1905621120. Its totient is φ = 526616880.

The previous prime is 1161551641. The next prime is 1161551669. The reversal of 1161551666 is 6661551611.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1161551669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59306 + ... + 76421.

It is an arithmetic number, because the mean of its divisors is an integer number (119101320).

Almost surely, 2^1161551666 is an apocalyptic number.

1161551666 is a deficient number, since it is larger than the sum of its proper divisors (744069454).

1161551666 is a wasteful number, since it uses less digits than its factorization.

1161551666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136129.

The product of its digits is 32400, while the sum is 38.

The square root of 1161551666 is about 34081.5443605480. The cubic root of 1161551666 is about 1051.1858607997.

Subtracting 1161551666 from its reverse (6661551611), we obtain a palindrome (5499999945).

The spelling of 1161551666 in words is "one billion, one hundred sixty-one million, five hundred fifty-one thousand, six hundred sixty-six".