2640418225 has 27 divisors (see below), whose sum is σ = 3366115563. Its totient is φ = 2054577840.

The previous prime is 2640418169. The next prime is 2640418243. The reversal of 2640418225 is 5228140462.

The square root of 2640418225 is 51385.

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

2640418225 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 only one way, i.e., 950550561 + 1689867664 = 30831^2 + 41108^2 .

It is not a de Polignac number, because 2640418225 - 2³¹ = 492934577 is a prime.

It is a super-4 number, since 4×2640418225⁴ (a number of 39 digits) contains 4444 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 11047656 + ... + 11047894.

Almost surely, 2^2640418225 is an apocalyptic number.

2640418225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2640418225 is the 51385-th square number.

2640418225 is the 25693-rd centered octagonal number.

It is an amenable number.

2640418225 is a deficient number, since it is larger than the sum of its proper divisors (725697338).

2640418225 is an frugal number, since it uses more digits than its factorization.

2640418225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574 (or 287 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 34.

The cubic root of 2640418225 is about 1382.1576247687.

Adding to 2640418225 its reverse (5228140462), we get a palindrome (7868558687).

The spelling of 2640418225 in words is "two billion, six hundred forty million, four hundred eighteen thousand, two hundred twenty-five".