66212087 has 2 divisors, whose sum is σ = 66212088. Its totient is φ = 66212086.

The previous prime is 66212077. The next prime is 66212119. The reversal of 66212087 is 78021266.

It is an a-pointer prime, because the next prime (66212119) can be obtained adding 66212087 to its sum of digits (32).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66212087 - 2⁴ = 66212071 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66212077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33106043 + 33106044.

It is an arithmetic number, because the mean of its divisors is an integer number (33106044).

Almost surely, 2^66212087 is an apocalyptic number.

66212087 is a deficient number, since it is larger than the sum of its proper divisors (1).

66212087 is an equidigital number, since it uses as much as digits as its factorization.

66212087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 66212087 is about 8137.0809876761. The cubic root of 66212087 is about 404.5564152107.

The spelling of 66212087 in words is "sixty-six million, two hundred twelve thousand, eighty-seven".