2665140625 has 63 divisors (see below), whose sum is σ = 3942078447. Its totient is φ = 1796550000.

The previous prime is 2665140623. The next prime is 2665140679. The reversal of 2665140625 is 5260415662.

The square root of 2665140625 is 51625.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 3 ways, for example, as 2334919041 + 330221584 = 48321^2 + 18172^2 .

It is not a de Polignac number, because 2665140625 - 2¹ = 2665140623 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2665140623) 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 62 ways as a sum of consecutive naturals, for example, 45171846 + ... + 45171904.

Almost surely, 2^2665140625 is an apocalyptic number.

2665140625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2665140625 is the 51625-th square number.

2665140625 is the 25813-rd centered octagonal number.

It is an amenable number.

2665140625 is a deficient number, since it is larger than the sum of its proper divisors (1276937822).

2665140625 is an frugal number, since it uses more digits than its factorization.

2665140625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162 (or 71 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 37.

The cubic root of 2665140625 is about 1386.4579736771.

It can be divided in two parts, 26651 and 40625, that added together give a palindrome (67276).

The spelling of 2665140625 in words is "two billion, six hundred sixty-five million, one hundred forty thousand, six hundred twenty-five".