65638525 has 6 divisors (see below), whose sum is σ = 81391802. Its totient is φ = 52510800.

The previous prime is 65638459. The next prime is 65638537. The reversal of 65638525 is 52583656.

It can be written as a sum of positive squares in 3 ways, for example, as 948676 + 64689849 = 974^2 + 8043^2 .

It is not a de Polignac number, because 65638525 - 2²³ = 57249917 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1312746 + ... + 1312795.

Almost surely, 2^65638525 is an apocalyptic number.

It is an amenable number.

65638525 is a deficient number, since it is larger than the sum of its proper divisors (15753277).

65638525 is a wasteful number, since it uses less digits than its factorization.

65638525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2625551 (or 2625546 counting only the distinct ones).

The product of its digits is 216000, while the sum is 40.

The square root of 65638525 is about 8101.7606111264. The cubic root of 65638525 is about 403.3848695995.

The spelling of 65638525 in words is "sixty-five million, six hundred thirty-eight thousand, five hundred twenty-five".