66312671 has 2 divisors, whose sum is σ = 66312672. Its totient is φ = 66312670.

The previous prime is 66312667. The next prime is 66312683. The reversal of 66312671 is 17621366.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66312671 - 2² = 66312667 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66312691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33156335 + 33156336.

It is an arithmetic number, because the mean of its divisors is an integer number (33156336).

Almost surely, 2^66312671 is an apocalyptic number.

66312671 is a deficient number, since it is larger than the sum of its proper divisors (1).

66312671 is an equidigital number, since it uses as much as digits as its factorization.

66312671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 32.

The square root of 66312671 is about 8143.2592369395. The cubic root of 66312671 is about 404.7611679299.

The spelling of 66312671 in words is "sixty-six million, three hundred twelve thousand, six hundred seventy-one".