65513925 has 18 divisors (see below), whose sum is σ = 117343122. Its totient is φ = 34940640.

The previous prime is 65513909. The next prime is 65513951. The reversal of 65513925 is 52931556.

It can be written as a sum of positive squares in 3 ways, for example, as 1089 + 65512836 = 33^2 + 8094^2 .

It is not a de Polignac number, because 65513925 - 2⁴ = 65513909 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 65513925.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 145362 + ... + 145811.

Almost surely, 2^65513925 is an apocalyptic number.

It is an amenable number.

65513925 is a deficient number, since it is larger than the sum of its proper divisors (51829197).

65513925 is a wasteful number, since it uses less digits than its factorization.

65513925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291189 (or 291181 counting only the distinct ones).

The product of its digits is 40500, while the sum is 36.

The square root of 65513925 is about 8094.0672717738. The cubic root of 65513925 is about 403.1294627233.

The spelling of 65513925 in words is "sixty-five million, five hundred thirteen thousand, nine hundred twenty-five".