66366731 has 2 divisors, whose sum is σ = 66366732. Its totient is φ = 66366730.

The previous prime is 66366683. The next prime is 66366733. The reversal of 66366731 is 13766366.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66366731 - 2¹⁰ = 66365707 is a prime.

It is a super-2 number, since 2×66366731² = 8809085967252722, which contains 22 as substring.

Together with 66366733, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66366733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33183365 + 33183366.

It is an arithmetic number, because the mean of its divisors is an integer number (33183366).

Almost surely, 2^66366731 is an apocalyptic number.

66366731 is a deficient number, since it is larger than the sum of its proper divisors (1).

66366731 is an equidigital number, since it uses as much as digits as its factorization.

66366731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 38.

The square root of 66366731 is about 8146.5778704926. The cubic root of 66366731 is about 404.8711290428.

The spelling of 66366731 in words is "sixty-six million, three hundred sixty-six thousand, seven hundred thirty-one".