6439260025 has 27 divisors (see below), whose sum is σ = 8782571343. Its totient is φ = 4679888400.

The previous prime is 6439260011. The next prime is 6439260031. The reversal of 6439260025 is 5200629346.

The square root of 6439260025 is 80245.

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

It can be written as a sum of positive squares in only one way, i.e., 2318133609 + 4121126416 = 48147^2 + 64196^2 .

It is not a de Polignac number, because 6439260025 - 2⁹ = 6439259513 is a prime.

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, 4412746 + ... + 4414204.

Almost surely, 2^6439260025 is an apocalyptic number.

6439260025 is the 80245-th square number.

6439260025 is the 40123-rd centered octagonal number.

It is an amenable number.

6439260025 is a deficient number, since it is larger than the sum of its proper divisors (2343311318).

6439260025 is an equidigital number, since it uses as much as digits as its factorization.

6439260025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2950 (or 1475 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 37.

The cubic root of 6439260025 is about 1860.4242321535.

The spelling of 6439260025 in words is "six billion, four hundred thirty-nine million, two hundred sixty thousand, twenty-five".