65757535021 has 2 divisors, whose sum is σ = 65757535022. Its totient is φ = 65757535020.

The previous prime is 65757535013. The next prime is 65757535031. The reversal of 65757535021 is 12053575756.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39192120900 + 26565414121 = 197970^2 + 162989^2 .

It is a cyclic number.

It is not a de Polignac number, because 65757535021 - 2³ = 65757535013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65757535001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32878767510 + 32878767511.

It is an arithmetic number, because the mean of its divisors is an integer number (32878767511).

Almost surely, 2^65757535021 is an apocalyptic number.

It is an amenable number.

65757535021 is a deficient number, since it is larger than the sum of its proper divisors (1).

65757535021 is an equidigital number, since it uses as much as digits as its factorization.

65757535021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1102500, while the sum is 46.

The spelling of 65757535021 in words is "sixty-five billion, seven hundred fifty-seven million, five hundred thirty-five thousand, twenty-one".