2561356744 has 32 divisors (see below), whose sum is σ = 4915653120. Its totient is φ = 1250637696.

The previous prime is 2561356739. The next prime is 2561356801. The reversal of 2561356744 is 4476531652.

It is a self number, because there is not a number n which added to its sum of digits gives 2561356744.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166732 + ... + 181444.

It is an arithmetic number, because the mean of its divisors is an integer number (153614160).

Almost surely, 2^2561356744 is an apocalyptic number.

It is an amenable number.

2561356744 is a deficient number, since it is larger than the sum of its proper divisors (2354296376).

2561356744 is a wasteful number, since it uses less digits than its factorization.

2561356744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15229 (or 15225 counting only the distinct ones).

The product of its digits is 604800, while the sum is 43.

The square root of 2561356744 is about 50609.8482906242. The cubic root of 2561356744 is about 1368.2223812869. Note that the first 3 decimals are identical.

The spelling of 2561356744 in words is "two billion, five hundred sixty-one million, three hundred fifty-six thousand, seven hundred forty-four".