2166682145 has 8 divisors (see below), whose sum is σ = 2611178856. Its totient is φ = 1725905536.

The previous prime is 2166682139. The next prime is 2166682183. The reversal of 2166682145 is 5412866612.

It can be written as a sum of positive squares in 4 ways, for example, as 11587216 + 2155094929 = 3404^2 + 46423^2 .

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 2166682145 - 2¹⁸ = 2166420001 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 928742 + ... + 931071.

It is an arithmetic number, because the mean of its divisors is an integer number (326397357).

Almost surely, 2^2166682145 is an apocalyptic number.

It is an amenable number.

2166682145 is a deficient number, since it is larger than the sum of its proper divisors (444496711).

2166682145 is a wasteful number, since it uses less digits than its factorization.

2166682145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1860051.

The product of its digits is 138240, while the sum is 41.

The square root of 2166682145 is about 46547.6330762371. The cubic root of 2166682145 is about 1293.9924274557.

The spelling of 2166682145 in words is "two billion, one hundred sixty-six million, six hundred eighty-two thousand, one hundred forty-five".