66146274091 has 2 divisors, whose sum is σ = 66146274092. Its totient is φ = 66146274090.

The previous prime is 66146274079. The next prime is 66146274109. The reversal of 66146274091 is 19047264166.

Together with next prime (66146274109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66146274091 is a prime.

It is a super-2 number, since 2×66146274091² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66146274031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33073137045 + 33073137046.

It is an arithmetic number, because the mean of its divisors is an integer number (33073137046).

Almost surely, 2^66146274091 is an apocalyptic number.

66146274091 is a deficient number, since it is larger than the sum of its proper divisors (1).

66146274091 is an equidigital number, since it uses as much as digits as its factorization.

66146274091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 46.

The spelling of 66146274091 in words is "sixty-six billion, one hundred forty-six million, two hundred seventy-four thousand, ninety-one".