2648666161 has 4 divisors (see below), whose sum is σ = 2649257572. Its totient is φ = 2648074752.

The previous prime is 2648666143. The next prime is 2648666183. The reversal of 2648666161 is 1616668462.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 995023936 + 1653642225 = 31544^2 + 40665^2 .

It is a cyclic number.

It is not a de Polignac number, because 2648666161 - 2⁵ = 2648666129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2648666261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 288936 + ... + 297961.

It is an arithmetic number, because the mean of its divisors is an integer number (662314393).

Almost surely, 2^2648666161 is an apocalyptic number.

It is an amenable number.

2648666161 is a deficient number, since it is larger than the sum of its proper divisors (591411).

2648666161 is an equidigital number, since it uses as much as digits as its factorization.

2648666161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591410.

The product of its digits is 497664, while the sum is 46.

The square root of 2648666161 is about 51465.1936846642. The cubic root of 2648666161 is about 1383.5952881896.

The spelling of 2648666161 in words is "two billion, six hundred forty-eight million, six hundred sixty-six thousand, one hundred sixty-one".