2665581823 has 2 divisors, whose sum is σ = 2665581824. Its totient is φ = 2665581822.

The previous prime is 2665581817. The next prime is 2665581833. The reversal of 2665581823 is 3281855662.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2665581823 - 2¹⁷ = 2665450751 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2665581833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1332790911 + 1332790912.

It is an arithmetic number, because the mean of its divisors is an integer number (1332790912).

Almost surely, 2^2665581823 is an apocalyptic number.

2665581823 is a deficient number, since it is larger than the sum of its proper divisors (1).

2665581823 is an equidigital number, since it uses as much as digits as its factorization.

2665581823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 691200, while the sum is 46.

The square root of 2665581823 is about 51629.2729272842. The cubic root of 2665581823 is about 1386.5344760485.

The spelling of 2665581823 in words is "two billion, six hundred sixty-five million, five hundred eighty-one thousand, eight hundred twenty-three".