65768257 has 4 divisors (see below), whose sum is σ = 69636996. Its totient is φ = 61899520.

The previous prime is 65768243. The next prime is 65768321. The reversal of 65768257 is 75286756.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18653761 + 47114496 = 4319^2 + 6864^2 .

It is a cyclic number.

It is not a de Polignac number, because 65768257 - 2²³ = 57379649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65768057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1934344 + ... + 1934377.

It is an arithmetic number, because the mean of its divisors is an integer number (17409249).

Almost surely, 2^65768257 is an apocalyptic number.

It is an amenable number.

65768257 is a deficient number, since it is larger than the sum of its proper divisors (3868739).

65768257 is a wasteful number, since it uses less digits than its factorization.

65768257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3868738.

The product of its digits is 705600, while the sum is 46.

The square root of 65768257 is about 8109.7630668226. The cubic root of 65768257 is about 403.6504528900.

The spelling of 65768257 in words is "sixty-five million, seven hundred sixty-eight thousand, two hundred fifty-seven".