66375641 has 2 divisors, whose sum is σ = 66375642. Its totient is φ = 66375640.

The previous prime is 66375629. The next prime is 66375643. The reversal of 66375641 is 14657366.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51897616 + 14478025 = 7204^2 + 3805^2 .

It is a cyclic number.

It is not a de Polignac number, because 66375641 - 2¹⁴ = 66359257 is a prime.

Together with 66375643, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 66375595 and 66375604.

It is not a weakly prime, because it can be changed into another prime (66375643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33187820 + 33187821.

It is an arithmetic number, because the mean of its divisors is an integer number (33187821).

Almost surely, 2^66375641 is an apocalyptic number.

It is an amenable number.

66375641 is a deficient number, since it is larger than the sum of its proper divisors (1).

66375641 is an equidigital number, since it uses as much as digits as its factorization.

66375641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 38.

The square root of 66375641 is about 8147.1247075272. The cubic root of 66375641 is about 404.8892467567.

The spelling of 66375641 in words is "sixty-six million, three hundred seventy-five thousand, six hundred forty-one".