4251661525 has 6 divisors (see below), whose sum is σ = 5272060322. Its totient is φ = 3401329200.

The previous prime is 4251661523. The next prime is 4251661567. The reversal of 4251661525 is 5251661524.

4251661525 is digitally balanced in base 3, 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 1408425841 + 2843235684 = 37529^2 + 53322^2 .

It is not a de Polignac number, because 4251661525 - 2¹ = 4251661523 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 (4251661523) 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, 85033206 + ... + 85033255.

Almost surely, 2^4251661525 is an apocalyptic number.

It is an amenable number.

4251661525 is a deficient number, since it is larger than the sum of its proper divisors (1020398797).

4251661525 is a wasteful number, since it uses less digits than its factorization.

4251661525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170066471 (or 170066466 counting only the distinct ones).

The product of its digits is 72000, while the sum is 37.

The square root of 4251661525 is about 65204.7661218105. The cubic root of 4251661525 is about 1620.0169592545.

Subtracting 4251661525 from its reverse (5251661524), we obtain a palindrome (999999999).

The spelling of 4251661525 in words is "four billion, two hundred fifty-one million, six hundred sixty-one thousand, five hundred twenty-five".