65680706537 has 2 divisors, whose sum is σ = 65680706538. Its totient is φ = 65680706536.

The previous prime is 65680706519. The next prime is 65680706593. The reversal of 65680706537 is 73560708656.

It is a happy number.

65680706537 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59408700121 + 6272006416 = 243739^2 + 79196^2 .

It is a cyclic number.

It is not a de Polignac number, because 65680706537 - 2⁸ = 65680706281 is a prime.

It is a super-2 number, since 2×65680706537² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (65680706137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32840353268 + 32840353269.

It is an arithmetic number, because the mean of its divisors is an integer number (32840353269).

Almost surely, 2^65680706537 is an apocalyptic number.

It is an amenable number.

65680706537 is a deficient number, since it is larger than the sum of its proper divisors (1).

65680706537 is an equidigital number, since it uses as much as digits as its factorization.

65680706537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6350400, while the sum is 53.

The spelling of 65680706537 in words is "sixty-five billion, six hundred eighty million, seven hundred six thousand, five hundred thirty-seven".