2166531305 has 8 divisors (see below), whose sum is σ = 2625579144. Its totient is φ = 1716064000.

The previous prime is 2166531293. The next prime is 2166531377. The reversal of 2166531305 is 5031356612.

It can be written as a sum of positive squares in 4 ways, for example, as 1212153856 + 954377449 = 34816^2 + 30893^2 .

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

It is not a de Polignac number, because 2166531305 - 2²⁶ = 2099422441 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2144576 + ... + 2145585.

It is an arithmetic number, because the mean of its divisors is an integer number (328197393).

Almost surely, 2^2166531305 is an apocalyptic number.

It is an amenable number.

2166531305 is a deficient number, since it is larger than the sum of its proper divisors (459047839).

2166531305 is a wasteful number, since it uses less digits than its factorization.

2166531305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4290267.

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 2166531305 is about 46546.0127723095. The cubic root of 2166531305 is about 1293.9623983860.

Adding to 2166531305 its reverse (5031356612), we get a palindrome (7197887917).

The spelling of 2166531305 in words is "two billion, one hundred sixty-six million, five hundred thirty-one thousand, three hundred five".