2567908561 has 4 divisors (see below), whose sum is σ = 2576273392. Its totient is φ = 2559543732.

The previous prime is 2567908547. The next prime is 2567908571. The reversal of 2567908561 is 1658097652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-2567908561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2567908571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4181955 + ... + 4182568.

It is an arithmetic number, because the mean of its divisors is an integer number (644068348).

Almost surely, 2^2567908561 is an apocalyptic number.

It is an amenable number.

2567908561 is a deficient number, since it is larger than the sum of its proper divisors (8364831).

2567908561 is an equidigital number, since it uses as much as digits as its factorization.

2567908561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8364830.

The product of its (nonzero) digits is 907200, while the sum is 49.

The square root of 2567908561 is about 50674.5356268807. The cubic root of 2567908561 is about 1369.3880018226.

The spelling of 2567908561 in words is "two billion, five hundred sixty-seven million, nine hundred eight thousand, five hundred sixty-one".