65808638057 has 8 divisors (see below), whose sum is σ = 66511142280. Its totient is φ = 65107929600.

The previous prime is 65808638047. The next prime is 65808638081. The reversal of 65808638057 is 75083680856.

It can be written as a sum of positive squares in 4 ways, for example, as 10114526041 + 55694112016 = 100571^2 + 235996^2 .

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 65808638057 - 2⁴ = 65808638041 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 65808637993 and 65808638011.

It is not an unprimeable number, because it can be changed into a prime (65808638017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 375194 + ... + 521907.

It is an arithmetic number, because the mean of its divisors is an integer number (8313892785).

Almost surely, 2^65808638057 is an apocalyptic number.

It is an amenable number.

65808638057 is a deficient number, since it is larger than the sum of its proper divisors (702504223).

65808638057 is a wasteful number, since it uses less digits than its factorization.

65808638057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 897883.

The product of its (nonzero) digits is 9676800, while the sum is 56.

The spelling of 65808638057 in words is "sixty-five billion, eight hundred eight million, six hundred thirty-eight thousand, fifty-seven".