65724161 has 2 divisors, whose sum is σ = 65724162. Its totient is φ = 65724160.

The previous prime is 65724157. The next prime is 65724181. The reversal of 65724161 is 16142756.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38056561 + 27667600 = 6169^2 + 5260^2 .

It is a cyclic number.

It is not a de Polignac number, because 65724161 - 2² = 65724157 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (65724181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32862080 + 32862081.

It is an arithmetic number, because the mean of its divisors is an integer number (32862081).

Almost surely, 2^65724161 is an apocalyptic number.

It is an amenable number.

65724161 is a deficient number, since it is larger than the sum of its proper divisors (1).

65724161 is an equidigital number, since it uses as much as digits as its factorization.

65724161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 32.

The square root of 65724161 is about 8107.0439125491. The cubic root of 65724161 is about 403.5602201512.

The spelling of 65724161 in words is "sixty-five million, seven hundred twenty-four thousand, one hundred sixty-one".