65005657 has 4 divisors (see below), whose sum is σ = 65069620. Its totient is φ = 64941696.

The previous prime is 65005649. The next prime is 65005673. The reversal of 65005657 is 75650056.

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 55666521 + 9339136 = 7461^2 + 3056^2 .

It is a cyclic number.

It is not a de Polignac number, because 65005657 - 2³ = 65005649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65005627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30432 + ... + 32497.

It is an arithmetic number, because the mean of its divisors is an integer number (16267405).

Almost surely, 2^65005657 is an apocalyptic number.

It is an amenable number.

65005657 is a deficient number, since it is larger than the sum of its proper divisors (63963).

65005657 is a wasteful number, since it uses less digits than its factorization.

65005657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63962.

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

The square root of 65005657 is about 8062.6085729124. The cubic root of 65005657 is about 402.0842397491.

The spelling of 65005657 in words is "sixty-five million, five thousand, six hundred fifty-seven".