65513257 has 8 divisors (see below), whose sum is σ = 69438600. Its totient is φ = 61595904.

The previous prime is 65513243. The next prime is 65513267. The reversal of 65513257 is 75231556.

It can be written as a sum of positive squares in 4 ways, for example, as 29800681 + 35712576 = 5459^2 + 5976^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 65513257 - 2²³ = 57124649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65513237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27219 + ... + 29527.

It is an arithmetic number, because the mean of its divisors is an integer number (8679825).

Almost surely, 2^65513257 is an apocalyptic number.

It is an amenable number.

65513257 is a deficient number, since it is larger than the sum of its proper divisors (3925343).

65513257 is a wasteful number, since it uses less digits than its factorization.

65513257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3995.

The product of its digits is 31500, while the sum is 34.

The square root of 65513257 is about 8094.0260068769. The cubic root of 65513257 is about 403.1280925749.

The spelling of 65513257 in words is "sixty-five million, five hundred thirteen thousand, two hundred fifty-seven".