66885231097 has 2 divisors, whose sum is σ = 66885231098. Its totient is φ = 66885231096.

The previous prime is 66885231079. The next prime is 66885231157. The reversal of 66885231097 is 79013258866.

Together with previous prime (66885231079) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59416987536 + 7468243561 = 243756^2 + 86419^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66885231097 is a prime.

It is not a weakly prime, because it can be changed into another prime (66885231067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33442615548 + 33442615549.

It is an arithmetic number, because the mean of its divisors is an integer number (33442615549).

Almost surely, 2^66885231097 is an apocalyptic number.

It is an amenable number.

66885231097 is a deficient number, since it is larger than the sum of its proper divisors (1).

66885231097 is an equidigital number, since it uses as much as digits as its factorization.

66885231097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4354560, while the sum is 55.

The spelling of 66885231097 in words is "sixty-six billion, eight hundred eighty-five million, two hundred thirty-one thousand, ninety-seven".