2605653823 has 4 divisors (see below), whose sum is σ = 2608625800. Its totient is φ = 2602681848.

The previous prime is 2605653811. The next prime is 2605653833. The reversal of 2605653823 is 3283565062.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2605653823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2605653833) 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, 1484673 + ... + 1486426.

It is an arithmetic number, because the mean of its divisors is an integer number (652156450).

Almost surely, 2^2605653823 is an apocalyptic number.

2605653823 is a deficient number, since it is larger than the sum of its proper divisors (2971977).

2605653823 is an equidigital number, since it uses as much as digits as its factorization.

2605653823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2971976.

The product of its (nonzero) digits is 259200, while the sum is 40.

The square root of 2605653823 is about 51045.6053250424. The cubic root of 2605653823 is about 1376.0648629102.

The spelling of 2605653823 in words is "two billion, six hundred five million, six hundred fifty-three thousand, eight hundred twenty-three".