66375613 has 2 divisors, whose sum is σ = 66375614. Its totient is φ = 66375612.

The previous prime is 66375593. The next prime is 66375623. The reversal of 66375613 is 31657366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61889689 + 4485924 = 7867^2 + 2118^2 .

It is a cyclic number.

It is not a de Polignac number, because 66375613 - 2¹³ = 66367421 is a prime.

It is a super-2 number, since 2×66375613² = 8811444002251538, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66375623) 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, 33187806 + 33187807.

It is an arithmetic number, because the mean of its divisors is an integer number (33187807).

Almost surely, 2^66375613 is an apocalyptic number.

It is an amenable number.

66375613 is a deficient number, since it is larger than the sum of its proper divisors (1).

66375613 is an equidigital number, since it uses as much as digits as its factorization.

66375613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 37.

The square root of 66375613 is about 8147.1229891294. The cubic root of 66375613 is about 404.8891898237.

The spelling of 66375613 in words is "sixty-six million, three hundred seventy-five thousand, six hundred thirteen".