2565365667 has 4 divisors (see below), whose sum is σ = 3420487560. Its totient is φ = 1710243776.

The previous prime is 2565365653. The next prime is 2565365669. The reversal of 2565365667 is 7665635652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2565365667 - 2¹² = 2565361571 is a prime.

It is a super-2 number, since 2×2565365667² = 13162202010844709778, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2565365669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 427560942 + ... + 427560947.

It is an arithmetic number, because the mean of its divisors is an integer number (855121890).

Almost surely, 2^2565365667 is an apocalyptic number.

2565365667 is a deficient number, since it is larger than the sum of its proper divisors (855121893).

2565365667 is an equidigital number, since it uses as much as digits as its factorization.

2565365667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 855121892.

The product of its digits is 6804000, while the sum is 51.

The square root of 2565365667 is about 50649.4389603676. The cubic root of 2565365667 is about 1368.9358363719.

The spelling of 2565365667 in words is "two billion, five hundred sixty-five million, three hundred sixty-five thousand, six hundred sixty-seven".