65521833137 has 2 divisors, whose sum is σ = 65521833138. Its totient is φ = 65521833136.

The previous prime is 65521833133. The next prime is 65521833161. The reversal of 65521833137 is 73133812556.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47249282161 + 18272550976 = 217369^2 + 135176^2 .

It is a cyclic number.

It is not a de Polignac number, because 65521833137 - 2² = 65521833133 is a prime.

It is a super-2 number, since 2×65521833137² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (65521833133) 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, 32760916568 + 32760916569.

It is an arithmetic number, because the mean of its divisors is an integer number (32760916569).

Almost surely, 2^65521833137 is an apocalyptic number.

It is an amenable number.

65521833137 is a deficient number, since it is larger than the sum of its proper divisors (1).

65521833137 is an equidigital number, since it uses as much as digits as its factorization.

65521833137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 453600, while the sum is 44.

The spelling of 65521833137 in words is "sixty-five billion, five hundred twenty-one million, eight hundred thirty-three thousand, one hundred thirty-seven".