65664037 has 2 divisors, whose sum is σ = 65664038. Its totient is φ = 65664036.

The previous prime is 65663993. The next prime is 65664041. The reversal of 65664037 is 73046656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37933281 + 27730756 = 6159^2 + 5266^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65664037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 65663987 and 65664005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65664077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32832018 + 32832019.

It is an arithmetic number, because the mean of its divisors is an integer number (32832019).

Almost surely, 2^65664037 is an apocalyptic number.

It is an amenable number.

65664037 is a deficient number, since it is larger than the sum of its proper divisors (1).

65664037 is an equidigital number, since it uses as much as digits as its factorization.

65664037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 37.

The square root of 65664037 is about 8103.3349307554. The cubic root of 65664037 is about 403.4371245914.

The spelling of 65664037 in words is "sixty-five million, six hundred sixty-four thousand, thirty-seven".