2561394595 has 8 divisors (see below), whose sum is σ = 3080258064. Its totient is φ = 2044725984.

The previous prime is 2561394587. The next prime is 2561394611. The reversal of 2561394595 is 5954931652.

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 2561394595 - 2³ = 2561394587 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 546144 + ... + 550813.

It is an arithmetic number, because the mean of its divisors is an integer number (385032258).

Almost surely, 2^2561394595 is an apocalyptic number.

2561394595 is a deficient number, since it is larger than the sum of its proper divisors (518863469).

2561394595 is a wasteful number, since it uses less digits than its factorization.

2561394595 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1097429.

The product of its digits is 1458000, while the sum is 49.

The square root of 2561394595 is about 50610.2222382001. Note that the first 4 decimals coincide. The cubic root of 2561394595 is about 1368.2291209871.

The spelling of 2561394595 in words is "two billion, five hundred sixty-one million, three hundred ninety-four thousand, five hundred ninety-five".