2561555546 has 48 divisors (see below), whose sum is σ = 4514520960. Its totient is φ = 1080645120.

The previous prime is 2561555531. The next prime is 2561555567. The reversal of 2561555546 is 6455551652.

2561555546 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 2561555497 and 2561555506.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 461375 + ... + 466893.

It is an arithmetic number, because the mean of its divisors is an integer number (94052520).

Almost surely, 2^2561555546 is an apocalyptic number.

2561555546 is a deficient number, since it is larger than the sum of its proper divisors (1952965414).

2561555546 is a wasteful number, since it uses less digits than its factorization.

2561555546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5639 (or 5622 counting only the distinct ones).

The product of its digits is 900000, while the sum is 44.

The square root of 2561555546 is about 50611.8123168890. The cubic root of 2561555546 is about 1368.2577789733.

The spelling of 2561555546 in words is "two billion, five hundred sixty-one million, five hundred fifty-five thousand, five hundred forty-six".