65257057 has 4 divisors (see below), whose sum is σ = 65465860. Its totient is φ = 65048256.

The previous prime is 65257051. The next prime is 65257061. The reversal of 65257057 is 75075256.

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 8088336 + 57168721 = 2844^2 + 7561^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65257057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65257051) 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, 103932 + ... + 104557.

It is an arithmetic number, because the mean of its divisors is an integer number (16366465).

Almost surely, 2^65257057 is an apocalyptic number.

It is an amenable number.

65257057 is a deficient number, since it is larger than the sum of its proper divisors (208803).

65257057 is a wasteful number, since it uses less digits than its factorization.

65257057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208802.

The product of its (nonzero) digits is 73500, while the sum is 37.

The square root of 65257057 is about 8078.1840162254. The cubic root of 65257057 is about 402.6019072494.

The spelling of 65257057 in words is "sixty-five million, two hundred fifty-seven thousand, fifty-seven".