1166728566 has 8 divisors (see below), whose sum is σ = 2333457144. Its totient is φ = 388909520.

The previous prime is 1166728531. The next prime is 1166728597. The reversal of 1166728566 is 6658276611.

It is a sphenic number, since it is the product of 3 distinct primes.

1166728566 is an admirable number.

It is a super-2 number, since 2×1166728566² = 2722511093440832712, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 97227375 + ... + 97227386.

It is an arithmetic number, because the mean of its divisors is an integer number (291682143).

Almost surely, 2^1166728566 is an apocalyptic number.

1166728566 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1166728566 is a wasteful number, since it uses less digits than its factorization.

1166728566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194454766.

The product of its digits is 725760, while the sum is 48.

The square root of 1166728566 is about 34157.4086546389. The cubic root of 1166728566 is about 1052.7452173015.

The spelling of 1166728566 in words is "one billion, one hundred sixty-six million, seven hundred twenty-eight thousand, five hundred sixty-six".