1161356666 has 16 divisors (see below), whose sum is σ = 1894361256. Its totient is φ = 531749376.

The previous prime is 1161356663. The next prime is 1161356671. The reversal of 1161356666 is 6666531611.

It can be written as a sum of positive squares in 4 ways, for example, as 1120843441 + 40513225 = 33479^2 + 6365^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1161356663) 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, 460331 + ... + 462846.

Almost surely, 2^1161356666 is an apocalyptic number.

1161356666 is a deficient number, since it is larger than the sum of its proper divisors (733004590).

1161356666 is a wasteful number, since it uses less digits than its factorization.

1161356666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 923233.

The product of its digits is 116640, while the sum is 41.

The square root of 1161356666 is about 34078.6834546172. The cubic root of 1161356666 is about 1051.1270335371.

The spelling of 1161356666 in words is "one billion, one hundred sixty-one million, three hundred fifty-six thousand, six hundred sixty-six".