2561553061 has 8 divisors (see below), whose sum is σ = 2574378464. Its totient is φ = 2548758960.

The previous prime is 2561553037. The next prime is 2561553073. The reversal of 2561553061 is 1603551652.

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

It is a cyclic number.

It is not a de Polignac number, because 2561553061 - 2⁷ = 2561552933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2561553361) 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, 165715 + ... + 180511.

It is an arithmetic number, because the mean of its divisors is an integer number (321797308).

Almost surely, 2^2561553061 is an apocalyptic number.

It is an amenable number.

2561553061 is a deficient number, since it is larger than the sum of its proper divisors (12825403).

2561553061 is a wasteful number, since it uses less digits than its factorization.

2561553061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15651.

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 2561553061 is about 50611.7877672781. The cubic root of 2561553061 is about 1368.2573365180.

The spelling of 2561553061 in words is "two billion, five hundred sixty-one million, five hundred fifty-three thousand, sixty-one".