65818481 has 2 divisors, whose sum is σ = 65818482. Its totient is φ = 65818480.

The previous prime is 65818469. The next prime is 65818483. The reversal of 65818481 is 18481856.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44102881 + 21715600 = 6641^2 + 4660^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65818481 is a prime.

It is a super-2 number, since 2×65818481² = 8664144882294722, which contains 22 as substring.

Together with 65818483, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (65818483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32909240 + 32909241.

It is an arithmetic number, because the mean of its divisors is an integer number (32909241).

Almost surely, 2^65818481 is an apocalyptic number.

It is an amenable number.

65818481 is a deficient number, since it is larger than the sum of its proper divisors (1).

65818481 is an equidigital number, since it uses as much as digits as its factorization.

65818481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61440, while the sum is 41.

The square root of 65818481 is about 8112.8589905162. The cubic root of 65818481 is about 403.7531761133.

The spelling of 65818481 in words is "sixty-five million, eight hundred eighteen thousand, four hundred eighty-one".