2561771373 has 32 divisors (see below), whose sum is σ = 3964676352. Its totient is φ = 1441152000.

The previous prime is 2561771309. The next prime is 2561771393. The reversal of 2561771373 is 3731771652.

2561771373 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2561771373 - 2⁶ = 2561771309 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2561771393) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 380565 + ... + 387237.

It is an arithmetic number, because the mean of its divisors is an integer number (123896136).

Almost surely, 2^2561771373 is an apocalyptic number.

It is an amenable number.

2561771373 is a deficient number, since it is larger than the sum of its proper divisors (1402904979).

2561771373 is a wasteful number, since it uses less digits than its factorization.

2561771373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6965.

The product of its digits is 185220, while the sum is 42.

The square root of 2561771373 is about 50613.9444520974. The cubic root of 2561771373 is about 1368.2962059724.

The spelling of 2561771373 in words is "two billion, five hundred sixty-one million, seven hundred seventy-one thousand, three hundred seventy-three".