65978441 has 2 divisors, whose sum is σ = 65978442. Its totient is φ = 65978440.

The previous prime is 65978413. The next prime is 65978477. The reversal of 65978441 is 14487956.

65978441 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48372025 + 17606416 = 6955^2 + 4196^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65978441 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 65978392 and 65978401.

It is not a weakly prime, because it can be changed into another prime (65978491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32989220 + 32989221.

It is an arithmetic number, because the mean of its divisors is an integer number (32989221).

Almost surely, 2^65978441 is an apocalyptic number.

It is an amenable number.

65978441 is a deficient number, since it is larger than the sum of its proper divisors (1).

65978441 is an equidigital number, since it uses as much as digits as its factorization.

65978441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 44.

The square root of 65978441 is about 8122.7114315357. The cubic root of 65978441 is about 404.0799946977.

The spelling of 65978441 in words is "sixty-five million, nine hundred seventy-eight thousand, four hundred forty-one".