65681937 has 6 divisors (see below), whose sum is σ = 94873922. Its totient is φ = 43787952.

The previous prime is 65681923. The next prime is 65681947. The reversal of 65681937 is 73918656.

It is a happy number.

65681937 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 43441281 + 22240656 = 6591^2 + 4716^2 .

It is not a de Polignac number, because 65681937 - 2⁴ = 65681921 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 65681892 and 65681901.

It is not an unprimeable number, because it can be changed into a prime (65681947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3648988 + ... + 3649005.

Almost surely, 2^65681937 is an apocalyptic number.

It is an amenable number.

65681937 is a deficient number, since it is larger than the sum of its proper divisors (29191985).

65681937 is a wasteful number, since it uses less digits than its factorization.

65681937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7297999 (or 7297996 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 65681937 is about 8104.4393390289. The cubic root of 65681937 is about 403.4737802138.

The spelling of 65681937 in words is "sixty-five million, six hundred eighty-one thousand, nine hundred thirty-seven".