65444381 has 2 divisors, whose sum is σ = 65444382. Its totient is φ = 65444380.

The previous prime is 65444293. The next prime is 65444383. The reversal of 65444381 is 18344456.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55741156 + 9703225 = 7466^2 + 3115^2 .

It is a cyclic number.

It is not a de Polignac number, because 65444381 - 2¹⁴ = 65427997 is a prime.

It is a super-2 number, since 2×65444381² = 8565934008946322, which contains 22 as substring.

Together with 65444383, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65444383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32722190 + 32722191.

It is an arithmetic number, because the mean of its divisors is an integer number (32722191).

Almost surely, 2^65444381 is an apocalyptic number.

It is an amenable number.

65444381 is a deficient number, since it is larger than the sum of its proper divisors (1).

65444381 is an equidigital number, since it uses as much as digits as its factorization.

65444381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46080, while the sum is 35.

The square root of 65444381 is about 8089.7701450659. The cubic root of 65444381 is about 402.9867695928.

The spelling of 65444381 in words is "sixty-five million, four hundred forty-four thousand, three hundred eighty-one".