2665128325 has 6 divisors (see below), whose sum is σ = 3304759154. Its totient is φ = 2132102640.

The previous prime is 2665128269. The next prime is 2665128329. The reversal of 2665128325 is 5238215662.

It is a happy number.

2665128325 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 909685921 + 1755442404 = 30161^2 + 41898^2 .

It is not a de Polignac number, because 2665128325 - 2⁹ = 2665127813 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 (2665128329) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53302542 + ... + 53302591.

Almost surely, 2^2665128325 is an apocalyptic number.

2665128325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2665128325 is a deficient number, since it is larger than the sum of its proper divisors (639630829).

2665128325 is a wasteful number, since it uses less digits than its factorization.

2665128325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106605143 (or 106605138 counting only the distinct ones).

The product of its digits is 172800, while the sum is 40.

The square root of 2665128325 is about 51624.8808715333. The cubic root of 2665128325 is about 1386.4558407741.

The spelling of 2665128325 in words is "two billion, six hundred sixty-five million, one hundred twenty-eight thousand, three hundred twenty-five".