2565164623 has 4 divisors (see below), whose sum is σ = 2931616720. Its totient is φ = 2198712528.

The previous prime is 2565164603. The next prime is 2565164627. The reversal of 2565164623 is 3264615652.

It is a happy number.

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 2565164623 - 2¹⁷ = 2565033551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2565164627) 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, 183226038 + ... + 183226051.

It is an arithmetic number, because the mean of its divisors is an integer number (732904180).

Almost surely, 2^2565164623 is an apocalyptic number.

2565164623 is a deficient number, since it is larger than the sum of its proper divisors (366452097).

2565164623 is an equidigital number, since it uses as much as digits as its factorization.

2565164623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366452096.

The product of its digits is 259200, while the sum is 40.

The square root of 2565164623 is about 50647.4542598145. The cubic root of 2565164623 is about 1368.9000749300.

The spelling of 2565164623 in words is "two billion, five hundred sixty-five million, one hundred sixty-four thousand, six hundred twenty-three".