2561440202 has 4 divisors (see below), whose sum is σ = 3842160306. Its totient is φ = 1280720100.

The previous prime is 2561440199. The next prime is 2561440207. The reversal of 2561440202 is 2020441652.

2561440202 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 2559449281 + 1990921 = 50591^2 + 1411^2 .

It is not an unprimeable number, because it can be changed into a prime (2561440207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640360049 + ... + 640360052.

Almost surely, 2^2561440202 is an apocalyptic number.

2561440202 is a deficient number, since it is larger than the sum of its proper divisors (1280720104).

2561440202 is a wasteful number, since it uses less digits than its factorization.

2561440202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280720103.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 2561440202 is about 50610.6728072252. The cubic root of 2561440202 is about 1368.2372416226.

Adding to 2561440202 its reverse (2020441652), we get a palindrome (4581881854).

The spelling of 2561440202 in words is "two billion, five hundred sixty-one million, four hundred forty thousand, two hundred two".