1166561471145 has 32 divisors (see below), whose sum is σ = 2135612915712. Its totient is φ = 532667259072.

The previous prime is 1166561471111. The next prime is 1166561471161. The reversal of 1166561471145 is 5411741656611.

It is not a de Polignac number, because 1166561471145 - 2²⁷ = 1166427253417 is a prime.

It is a super-2 number, since 2×1166561471145² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1166561471094 and 1166561471103.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6346297 + ... + 6527526.

It is an arithmetic number, because the mean of its divisors is an integer number (66737903616).

Almost surely, 2^{1166561471145} is an apocalyptic number.

1166561471145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1166561471145 is a deficient number, since it is larger than the sum of its proper divisors (969051444567).

1166561471145 is a wasteful number, since it uses less digits than its factorization.

1166561471145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12874701.

The product of its digits is 604800, while the sum is 48.

The spelling of 1166561471145 in words is "one trillion, one hundred sixty-six billion, five hundred sixty-one million, four hundred seventy-one thousand, one hundred forty-five".