65681867 has 2 divisors, whose sum is σ = 65681868. Its totient is φ = 65681866.

The previous prime is 65681851. The next prime is 65681881. The reversal of 65681867 is 76818656.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65681867 - 2⁴ = 65681851 is a prime.

It is not a weakly prime, because it can be changed into another prime (65681827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32840933 + 32840934.

It is an arithmetic number, because the mean of its divisors is an integer number (32840934).

Almost surely, 2^65681867 is an apocalyptic number.

65681867 is a deficient number, since it is larger than the sum of its proper divisors (1).

65681867 is an equidigital number, since it uses as much as digits as its factorization.

65681867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 483840, while the sum is 47.

The square root of 65681867 is about 8104.4350204070. The cubic root of 65681867 is about 403.4736368807.

The spelling of 65681867 in words is "sixty-five million, six hundred eighty-one thousand, eight hundred sixty-seven".