66945163 has 2 divisors, whose sum is σ = 66945164. Its totient is φ = 66945162.

The previous prime is 66945107. The next prime is 66945181. The reversal of 66945163 is 36154966.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66945163 is a prime.

It is a super-3 number, since 3×66945163³ (a number of 24 digits) contains 333 as substring.

It is equal to p_3948727 and since 66945163 and 3948727 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (66945103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33472581 + 33472582.

It is an arithmetic number, because the mean of its divisors is an integer number (33472582).

Almost surely, 2^66945163 is an apocalyptic number.

66945163 is a deficient number, since it is larger than the sum of its proper divisors (1).

66945163 is an equidigital number, since it uses as much as digits as its factorization.

66945163 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116640, while the sum is 40.

The square root of 66945163 is about 8182.0023832800. The cubic root of 66945163 is about 406.0439722812.

The spelling of 66945163 in words is "sixty-six million, nine hundred forty-five thousand, one hundred sixty-three".