66206151593 has 2 divisors, whose sum is σ = 66206151594. Its totient is φ = 66206151592.

The previous prime is 66206151589. The next prime is 66206151629. The reversal of 66206151593 is 39515160266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53785494889 + 12420656704 = 231917^2 + 111448^2 .

It is a cyclic number.

It is not a de Polignac number, because 66206151593 - 2² = 66206151589 is a prime.

It is not a weakly prime, because it can be changed into another prime (66206151533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33103075796 + 33103075797.

It is an arithmetic number, because the mean of its divisors is an integer number (33103075797).

Almost surely, 2^66206151593 is an apocalyptic number.

It is an amenable number.

66206151593 is a deficient number, since it is larger than the sum of its proper divisors (1).

66206151593 is an equidigital number, since it uses as much as digits as its factorization.

66206151593 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 291600, while the sum is 44.

The spelling of 66206151593 in words is "sixty-six billion, two hundred six million, one hundred fifty-one thousand, five hundred ninety-three".