2605561403 has 4 divisors (see below), whose sum is σ = 2607054600. Its totient is φ = 2604068208.

The previous prime is 2605561391. The next prime is 2605561433. The reversal of 2605561403 is 3041655062.

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

It is a cyclic number.

It is not a de Polignac number, because 2605561403 - 2⁶ = 2605561339 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2605561403.

It is not an unprimeable number, because it can be changed into a prime (2605561433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 743978 + ... + 747471.

It is an arithmetic number, because the mean of its divisors is an integer number (651763650).

Almost surely, 2^2605561403 is an apocalyptic number.

2605561403 is a deficient number, since it is larger than the sum of its proper divisors (1493197).

2605561403 is a wasteful number, since it uses less digits than its factorization.

2605561403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1493196.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 2605561403 is about 51044.7000480951. The cubic root of 2605561403 is about 1376.0485934916.

The spelling of 2605561403 in words is "two billion, six hundred five million, five hundred sixty-one thousand, four hundred three".