66626017 has 2 divisors, whose sum is σ = 66626018. Its totient is φ = 66626016.

The previous prime is 66625987. The next prime is 66626029. The reversal of 66626017 is 71062666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37075921 + 29550096 = 6089^2 + 5436^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66626017 is a prime.

It is a super-2 number, since 2×66626017² = 8878052282568578, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66626047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33313008 + 33313009.

It is an arithmetic number, because the mean of its divisors is an integer number (33313009).

Almost surely, 2^66626017 is an apocalyptic number.

It is an amenable number.

66626017 is a deficient number, since it is larger than the sum of its proper divisors (1).

66626017 is an equidigital number, since it uses as much as digits as its factorization.

66626017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 66626017 is about 8162.4761561673. The cubic root of 66626017 is about 405.3977031210.

It can be divided in two parts, 666260 and 17, that multiplied together give a triangular number (11326420 = T₄₇₅₉).

The spelling of 66626017 in words is "sixty-six million, six hundred twenty-six thousand, seventeen".