66326579497 has 2 divisors, whose sum is σ = 66326579498.
Its totient is φ = 66326579496.
The previous prime is 66326579471. The next prime is 66326579591. The reversal of 66326579497 is 79497562366.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 61601254416 + 4725325081 = 248196^2 + 68741^2
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-66326579497 is a prime.
It is not a weakly prime, because it can be changed into another prime (66326579447) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33163289748 + 33163289749.
It is an arithmetic number, because the mean of its divisors is an integer number (33163289749).
Almost surely, 266326579497 is an apocalyptic number.
It is an amenable number.
66326579497 is a deficient number, since it is larger than the sum of its proper divisors (1).
66326579497 is an equidigital number, since it uses as much as digits as its factorization.
66326579497 is an evil number, because the sum of its binary digits is even.
The product of its digits is 102876480, while the sum is 64.
The spelling of 66326579497 in words is "sixty-six billion, three hundred twenty-six million, five hundred seventy-nine thousand, four hundred ninety-seven".