65666851 has 2 divisors, whose sum is σ = 65666852. Its totient is φ = 65666850.

The previous prime is 65666813. The next prime is 65666857. The reversal of 65666851 is 15866656.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65666851 - 2¹⁷ = 65535779 is a prime.

It is equal to p_3877549 and since 65666851 and 3877549 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 65666798 and 65666807.

It is not a weakly prime, because it can be changed into another prime (65666857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32833425 + 32833426.

It is an arithmetic number, because the mean of its divisors is an integer number (32833426).

Almost surely, 2^65666851 is an apocalyptic number.

65666851 is a deficient number, since it is larger than the sum of its proper divisors (1).

65666851 is an equidigital number, since it uses as much as digits as its factorization.

65666851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 259200, while the sum is 43.

The square root of 65666851 is about 8103.5085611110. The cubic root of 65666851 is about 403.4428875422.

The spelling of 65666851 in words is "sixty-five million, six hundred sixty-six thousand, eight hundred fifty-one".