66340481 has 2 divisors, whose sum is σ = 66340482. Its totient is φ = 66340480.

The previous prime is 66340433. The next prime is 66340499. The reversal of 66340481 is 18404366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47059600 + 19280881 = 6860^2 + 4391^2 .

It is a cyclic number.

It is not a de Polignac number, because 66340481 - 2²² = 62146177 is a prime.

It is a super-2 number, since 2×66340481² = 8802118838622722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66340411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33170240 + 33170241.

It is an arithmetic number, because the mean of its divisors is an integer number (33170241).

Almost surely, 2^66340481 is an apocalyptic number.

It is an amenable number.

66340481 is a deficient number, since it is larger than the sum of its proper divisors (1).

66340481 is an equidigital number, since it uses as much as digits as its factorization.

66340481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 66340481 is about 8144.9666052109. The cubic root of 66340481 is about 404.8177425117.

The spelling of 66340481 in words is "sixty-six million, three hundred forty thousand, four hundred eighty-one".