2561010243 has 8 divisors (see below), whose sum is σ = 3725105856. Its totient is φ = 1552127400.

The previous prime is 2561010239. The next prime is 2561010259. The reversal of 2561010243 is 3420101652.

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

It is not a de Polignac number, because 2561010243 - 2² = 2561010239 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2561014243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38803153 + ... + 38803218.

It is an arithmetic number, because the mean of its divisors is an integer number (465638232).

Almost surely, 2^2561010243 is an apocalyptic number.

2561010243 is a deficient number, since it is larger than the sum of its proper divisors (1164095613).

2561010243 is a wasteful number, since it uses less digits than its factorization.

2561010243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77606385.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 2561010243 is about 50606.4249181860. The cubic root of 2561010243 is about 1368.1606806791.

Adding to 2561010243 its reverse (3420101652), we get a palindrome (5981111895).

It can be divided in two parts, 25610 and 10243, that added together give a palindrome (35853).

The spelling of 2561010243 in words is "two billion, five hundred sixty-one million, ten thousand, two hundred forty-three".