2565506015 has 4 divisors (see below), whose sum is σ = 3078607224. Its totient is φ = 2052404808.

The previous prime is 2565506011. The next prime is 2565506017. The reversal of 2565506015 is 5106055652.

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 2565506015 - 2² = 2565506011 is a prime.

It is a super-2 number, since 2×2565506015² = 13163642226002360450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2565506011) 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, 256550597 + ... + 256550606.

It is an arithmetic number, because the mean of its divisors is an integer number (769651806).

Almost surely, 2^2565506015 is an apocalyptic number.

2565506015 is a deficient number, since it is larger than the sum of its proper divisors (513101209).

2565506015 is an equidigital number, since it uses as much as digits as its factorization.

2565506015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513101208.

The product of its (nonzero) digits is 45000, while the sum is 35.

The square root of 2565506015 is about 50650.8244256695. The cubic root of 2565506015 is about 1368.9608001819.

The spelling of 2565506015 in words is "two billion, five hundred sixty-five million, five hundred six thousand, fifteen".