2561221652 has 24 divisors (see below), whose sum is σ = 5058214560. Its totient is φ = 1124046560.

The previous prime is 2561221639. The next prime is 2561221667.

2561221652 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1002338 + ... + 1004889.

It is an arithmetic number, because the mean of its divisors is an integer number (210758940).

Almost surely, 2^2561221652 is an apocalyptic number.

2561221652 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

2561221652 is a deficient number, since it is larger than the sum of its proper divisors (2496992908).

2561221652 is a wasteful number, since it uses less digits than its factorization.

2561221652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2007271 (or 2007269 counting only the distinct ones).

The product of its digits is 14400, while the sum is 32.

The square root of 2561221652 is about 50608.5136316016. The cubic root of 2561221652 is about 1368.1983264381.

The spelling of 2561221652 in words is "two billion, five hundred sixty-one million, two hundred twenty-one thousand, six hundred fifty-two".