65840851 has 2 divisors, whose sum is σ = 65840852. Its totient is φ = 65840850.

The previous prime is 65840839. The next prime is 65840857. The reversal of 65840851 is 15804856.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65840851 - 2¹⁷ = 65709779 is a prime.

It is equal to p_3887236 and since 65840851 and 3887236 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 65840851.

It is not a weakly prime, because it can be changed into another prime (65840857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32920425 + 32920426.

It is an arithmetic number, because the mean of its divisors is an integer number (32920426).

Almost surely, 2^65840851 is an apocalyptic number.

65840851 is a deficient number, since it is larger than the sum of its proper divisors (1).

65840851 is an equidigital number, since it uses as much as digits as its factorization.

65840851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38400, while the sum is 37.

The square root of 65840851 is about 8114.2375489013. The cubic root of 65840851 is about 403.7989126874.

The spelling of 65840851 in words is "sixty-five million, eight hundred forty thousand, eight hundred fifty-one".