1166000561 has 8 divisors (see below), whose sum is σ = 1281286944. Its totient is φ = 1052261920.

The previous prime is 1166000533. The next prime is 1166000567. The reversal of 1166000561 is 1650006611.

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

It is a cyclic number.

It is not a de Polignac number, because 1166000561 - 2¹⁴ = 1165984177 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1166000561.

It is not an unprimeable number, because it can be changed into a prime (1166000567) 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, 385355 + ... + 388368.

It is an arithmetic number, because the mean of its divisors is an integer number (160160868).

Almost surely, 2^1166000561 is an apocalyptic number.

1166000561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1166000561 is a deficient number, since it is larger than the sum of its proper divisors (115286383).

1166000561 is a wasteful number, since it uses less digits than its factorization.

1166000561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 773871.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 1166000561 is about 34146.7503724732. The cubic root of 1166000561 is about 1052.5262108521.

The spelling of 1166000561 in words is "one billion, one hundred sixty-six million, five hundred sixty-one", and thus it is an aban number.