2561361626 has 8 divisors (see below), whose sum is σ = 3899386560. Its totient is φ = 1261566108.

The previous prime is 2561361623. The next prime is 2561361659. The reversal of 2561361626 is 6261631652.

It is a happy number.

2561361626 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 2561361626.

It is not an unprimeable number, because it can be changed into a prime (2561361623) 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, 9557186 + ... + 9557453.

It is an arithmetic number, because the mean of its divisors is an integer number (487423320).

Almost surely, 2^2561361626 is an apocalyptic number.

2561361626 is a deficient number, since it is larger than the sum of its proper divisors (1338024934).

2561361626 is a wasteful number, since it uses less digits than its factorization.

2561361626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19114708.

The product of its digits is 77760, while the sum is 38.

The square root of 2561361626 is about 50609.8965223206. The cubic root of 2561361626 is about 1368.2232505732.

The spelling of 2561361626 in words is "two billion, five hundred sixty-one million, three hundred sixty-one thousand, six hundred twenty-six".