66397601 has 2 divisors, whose sum is σ = 66397602. Its totient is φ = 66397600.

The previous prime is 66397589. The next prime is 66397613. The reversal of 66397601 is 10679366.

It is a balanced prime because it is at equal distance from previous prime (66397589) and next prime (66397613).

It can be written as a sum of positive squares in only one way, i.e., 63760225 + 2637376 = 7985^2 + 1624^2 .

It is a cyclic number.

It is not a de Polignac number, because 66397601 - 2⁶ = 66397537 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66397651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33198800 + 33198801.

It is an arithmetic number, because the mean of its divisors is an integer number (33198801).

Almost surely, 2^66397601 is an apocalyptic number.

It is an amenable number.

66397601 is a deficient number, since it is larger than the sum of its proper divisors (1).

66397601 is an equidigital number, since it uses as much as digits as its factorization.

66397601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 38.

The square root of 66397601 is about 8148.4723108077. The cubic root of 66397601 is about 404.9338935948.

The spelling of 66397601 in words is "sixty-six million, three hundred ninety-seven thousand, six hundred one".