2561405603 has 8 divisors (see below), whose sum is σ = 2674652928. Its totient is φ = 2448315144.

The previous prime is 2561405573. The next prime is 2561405621. The reversal of 2561405603 is 3065041652.

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 2561405603 - 2²² = 2557211299 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 2561405603.

It is not an unprimeable number, because it can be changed into a prime (2561405633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5201 + ... + 71762.

It is an arithmetic number, because the mean of its divisors is an integer number (334331616).

Almost surely, 2^2561405603 is an apocalyptic number.

2561405603 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

2561405603 is a deficient number, since it is larger than the sum of its proper divisors (113247325).

2561405603 is a wasteful number, since it uses less digits than its factorization.

2561405603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78433.

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

The square root of 2561405603 is about 50610.3309908165. The cubic root of 2561405603 is about 1368.2310810450.

The spelling of 2561405603 in words is "two billion, five hundred sixty-one million, four hundred five thousand, six hundred three".