65134157521 has 2 divisors, whose sum is σ = 65134157522. Its totient is φ = 65134157520.

The previous prime is 65134157437. The next prime is 65134157537. The reversal of 65134157521 is 12575143156.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46681923600 + 18452233921 = 216060^2 + 135839^2 .

It is a cyclic number.

It is not a de Polignac number, because 65134157521 - 2²¹ = 65132060369 is a prime.

It is not a weakly prime, because it can be changed into another prime (65134157581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32567078760 + 32567078761.

It is an arithmetic number, because the mean of its divisors is an integer number (32567078761).

Almost surely, 2^65134157521 is an apocalyptic number.

It is an amenable number.

65134157521 is a deficient number, since it is larger than the sum of its proper divisors (1).

65134157521 is an equidigital number, since it uses as much as digits as its factorization.

65134157521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 126000, while the sum is 40.

The spelling of 65134157521 in words is "sixty-five billion, one hundred thirty-four million, one hundred fifty-seven thousand, five hundred twenty-one".