65617861 has 2 divisors, whose sum is σ = 65617862. Its totient is φ = 65617860.

The previous prime is 65617843. The next prime is 65617897. The reversal of 65617861 is 16871656.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43480836 + 22137025 = 6594^2 + 4705^2 .

It is a cyclic number.

It is not a de Polignac number, because 65617861 - 2⁵ = 65617829 is a prime.

It is equal to p_3874873 and since 65617861 and 3874873 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65617801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32808930 + 32808931.

It is an arithmetic number, because the mean of its divisors is an integer number (32808931).

Almost surely, 2^65617861 is an apocalyptic number.

It is an amenable number.

65617861 is a deficient number, since it is larger than the sum of its proper divisors (1).

65617861 is an equidigital number, since it uses as much as digits as its factorization.

65617861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 40.

The square root of 65617861 is about 8100.4852323796. The cubic root of 65617861 is about 403.3425346048.

The spelling of 65617861 in words is "sixty-five million, six hundred seventeen thousand, eight hundred sixty-one".