65250256509 has 16 divisors (see below), whose sum is σ = 98305473600. Its totient is φ = 42762878928.

The previous prime is 65250256499. The next prime is 65250256523. The reversal of 65250256509 is 90565205256.

65250256509 is a `hidden beast` number, since 65 + 25 + 0 + 2 + 565 + 0 + 9 = 666.

It is not a de Polignac number, because 65250256509 - 2⁴ = 65250256493 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65250256559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20478714 + ... + 20481899.

It is an arithmetic number, because the mean of its divisors is an integer number (6144092100).

Almost surely, 2^65250256509 is an apocalyptic number.

It is an amenable number.

65250256509 is a deficient number, since it is larger than the sum of its proper divisors (33055217091).

65250256509 is a wasteful number, since it uses less digits than its factorization.

65250256509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40960681 (or 40960675 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 45.

The spelling of 65250256509 in words is "sixty-five billion, two hundred fifty million, two hundred fifty-six thousand, five hundred nine".