1165990666 has 16 divisors (see below), whose sum is σ = 1791979200. Its totient is φ = 568699488.

The previous prime is 1165990649. The next prime is 1165990669. The reversal of 1165990666 is 6660995611.

It is not an unprimeable number, because it can be changed into a prime (1165990669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61195 + ... + 77953.

It is an arithmetic number, because the mean of its divisors is an integer number (111998700).

Almost surely, 2^1165990666 is an apocalyptic number.

1165990666 is a deficient number, since it is larger than the sum of its proper divisors (625988534).

1165990666 is a wasteful number, since it uses less digits than its factorization.

1165990666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17613.

The product of its (nonzero) digits is 524880, while the sum is 49.

The square root of 1165990666 is about 34146.6054828295. The cubic root of 1165990666 is about 1052.5232335018.

The spelling of 1165990666 in words is "one billion, one hundred sixty-five million, nine hundred ninety thousand, six hundred sixty-six".