2525961665 has 4 divisors (see below), whose sum is σ = 3031154004. Its totient is φ = 2020769328.

The previous prime is 2525961619. The next prime is 2525961667. The reversal of 2525961665 is 5661695252.

2525961665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 732947329 + 1793014336 = 27073^2 + 42344^2 .

It is a cyclic number.

It is not a de Polignac number, because 2525961665 - 2¹⁰ = 2525960641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2525961667) 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, 252596162 + ... + 252596171.

It is an arithmetic number, because the mean of its divisors is an integer number (757788501).

Almost surely, 2^2525961665 is an apocalyptic number.

It is an amenable number.

2525961665 is a deficient number, since it is larger than the sum of its proper divisors (505192339).

2525961665 is an equidigital number, since it uses as much as digits as its factorization.

2525961665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505192338.

The product of its digits is 972000, while the sum is 47.

The square root of 2525961665 is about 50258.9461190742. The cubic root of 2525961665 is about 1361.8906922928.

The spelling of 2525961665 in words is "two billion, five hundred twenty-five million, nine hundred sixty-one thousand, six hundred sixty-five".