66180479 has 2 divisors, whose sum is σ = 66180480. Its totient is φ = 66180478.

The previous prime is 66180469. The next prime is 66180497. The reversal of 66180479 is 97408166.

Together with next prime (66180497) 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 not a de Polignac number, because 66180479 - 2¹⁶ = 66114943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66180409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33090239 + 33090240.

It is an arithmetic number, because the mean of its divisors is an integer number (33090240).

Almost surely, 2^66180479 is an apocalyptic number.

66180479 is a deficient number, since it is larger than the sum of its proper divisors (1).

66180479 is an equidigital number, since it uses as much as digits as its factorization.

66180479 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 66180479 is about 8135.1385360054. The cubic root of 66180479 is about 404.4920299146.

The spelling of 66180479 in words is "sixty-six million, one hundred eighty thousand, four hundred seventy-nine".