2561554363 has 4 divisors (see below), whose sum is σ = 2630785600. Its totient is φ = 2492323128.

The previous prime is 2561554351. The next prime is 2561554403. The reversal of 2561554363 is 3634551652.

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

It is a cyclic number.

It is not a de Polignac number, because 2561554363 - 2¹³ = 2561546171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2561554343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34615563 + ... + 34615636.

It is an arithmetic number, because the mean of its divisors is an integer number (657696400).

Almost surely, 2^2561554363 is an apocalyptic number.

2561554363 is a deficient number, since it is larger than the sum of its proper divisors (69231237).

2561554363 is an equidigital number, since it uses as much as digits as its factorization.

2561554363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69231236.

The product of its digits is 324000, while the sum is 40.

The square root of 2561554363 is about 50611.8006298926. The cubic root of 2561554363 is about 1368.2575683397.

The spelling of 2561554363 in words is "two billion, five hundred sixty-one million, five hundred fifty-four thousand, three hundred sixty-three".