66309855097 has 2 divisors, whose sum is σ = 66309855098. Its totient is φ = 66309855096.

The previous prime is 66309855037. The next prime is 66309855109. The reversal of 66309855097 is 79055890366.

66309855097 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40638124921 + 25671730176 = 201589^2 + 160224^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66309855097 is a prime.

It is not a weakly prime, because it can be changed into another prime (66309855037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33154927548 + 33154927549.

It is an arithmetic number, because the mean of its divisors is an integer number (33154927549).

Almost surely, 2^66309855097 is an apocalyptic number.

It is an amenable number.

66309855097 is a deficient number, since it is larger than the sum of its proper divisors (1).

66309855097 is an equidigital number, since it uses as much as digits as its factorization.

66309855097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12247200, while the sum is 58.

The spelling of 66309855097 in words is "sixty-six billion, three hundred nine million, eight hundred fifty-five thousand, ninety-seven".