66605011097 has 2 divisors, whose sum is σ = 66605011098. Its totient is φ = 66605011096.

The previous prime is 66605011063. The next prime is 66605011111. The reversal of 66605011097 is 79011050666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65913373696 + 691637401 = 256736^2 + 26299^2 .

It is a cyclic number.

It is not a de Polignac number, because 66605011097 - 2³⁰ = 65531269273 is a prime.

It is not a weakly prime, because it can be changed into another prime (66605011007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33302505548 + 33302505549.

It is an arithmetic number, because the mean of its divisors is an integer number (33302505549).

Almost surely, 2^66605011097 is an apocalyptic number.

It is an amenable number.

66605011097 is a deficient number, since it is larger than the sum of its proper divisors (1).

66605011097 is an equidigital number, since it uses as much as digits as its factorization.

66605011097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68040, while the sum is 41.

The spelling of 66605011097 in words is "sixty-six billion, six hundred five million, eleven thousand, ninety-seven".