65757535521 has 16 divisors (see below), whose sum is σ = 87821881344. Its totient is φ = 43765819344.

The previous prime is 65757535447. The next prime is 65757535573. The reversal of 65757535521 is 12553575756.

It is a de Polignac number, because none of the positive numbers 2^k-65757535521 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (65757535021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10496236 + ... + 10502498.

It is an arithmetic number, because the mean of its divisors is an integer number (5488867584).

Almost surely, 2^65757535521 is an apocalyptic number.

It is an amenable number.

65757535521 is a deficient number, since it is larger than the sum of its proper divisors (22064345823).

65757535521 is a wasteful number, since it uses less digits than its factorization.

65757535521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11500.

The product of its digits is 5512500, while the sum is 51.

The spelling of 65757535521 in words is "sixty-five billion, seven hundred fifty-seven million, five hundred thirty-five thousand, five hundred twenty-one".