1166561471143 has 16 divisors (see below), whose sum is σ = 1186637903136. Its totient is φ = 1146663290880.

The previous prime is 1166561471111. The next prime is 1166561471161. The reversal of 1166561471143 is 3411741656611.

It is not a de Polignac number, because 1166561471143 - 2⁵ = 1166561471111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1166561471093 and 1166561471102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1166561471443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16258555 + ... + 16330147.

It is an arithmetic number, because the mean of its divisors is an integer number (74164868946).

Almost surely, 2^{1166561471143} is an apocalyptic number.

1166561471143 is a deficient number, since it is larger than the sum of its proper divisors (20076431993).

1166561471143 is an equidigital number, since it uses as much as digits as its factorization.

1166561471143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72834.

The product of its digits is 362880, while the sum is 46.

The spelling of 1166561471143 in words is "one trillion, one hundred sixty-six billion, five hundred sixty-one million, four hundred seventy-one thousand, one hundred forty-three".