66380593 has 2 divisors, whose sum is σ = 66380594. Its totient is φ = 66380592.

The previous prime is 66380491. The next prime is 66380617. The reversal of 66380593 is 39508366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64272289 + 2108304 = 8017^2 + 1452^2 .

It is a cyclic number.

It is not a de Polignac number, because 66380593 - 2⁹ = 66380081 is a prime.

It is not a weakly prime, because it can be changed into another prime (66380693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33190296 + 33190297.

It is an arithmetic number, because the mean of its divisors is an integer number (33190297).

Almost surely, 2^66380593 is an apocalyptic number.

It is an amenable number.

66380593 is a deficient number, since it is larger than the sum of its proper divisors (1).

66380593 is an equidigital number, since it uses as much as digits as its factorization.

66380593 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 116640, while the sum is 40.

The square root of 66380593 is about 8147.4286127588. The cubic root of 66380593 is about 404.8993155192.

The spelling of 66380593 in words is "sixty-six million, three hundred eighty thousand, five hundred ninety-three".