65766257 has 4 divisors (see below), whose sum is σ = 65790180. Its totient is φ = 65742336.

The previous prime is 65766227. The next prime is 65766271. The reversal of 65766257 is 75266756.

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 38056561 + 27709696 = 6169^2 + 5264^2 .

It is a cyclic number.

It is not a de Polignac number, because 65766257 - 2⁶ = 65766193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65766227) 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, 7208 + ... + 13545.

It is an arithmetic number, because the mean of its divisors is an integer number (16447545).

Almost surely, 2^65766257 is an apocalyptic number.

It is an amenable number.

65766257 is a deficient number, since it is larger than the sum of its proper divisors (23923).

65766257 is a wasteful number, since it uses less digits than its factorization.

65766257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23922.

The product of its digits is 529200, while the sum is 44.

The square root of 65766257 is about 8109.6397577204. The cubic root of 65766257 is about 403.6463612044.

The spelling of 65766257 in words is "sixty-five million, seven hundred sixty-six thousand, two hundred fifty-seven".