66968567 has 2 divisors, whose sum is σ = 66968568. Its totient is φ = 66968566.

The previous prime is 66968543. The next prime is 66968579. The reversal of 66968567 is 76586966.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66968567 - 2¹⁰ = 66967543 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 (66968527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33484283 + 33484284.

It is an arithmetic number, because the mean of its divisors is an integer number (33484284).

Almost surely, 2^66968567 is an apocalyptic number.

66968567 is a deficient number, since it is larger than the sum of its proper divisors (1).

66968567 is an equidigital number, since it uses as much as digits as its factorization.

66968567 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3265920, while the sum is 53.

The square root of 66968567 is about 8183.4324705468. The cubic root of 66968567 is about 406.0912843672.

The spelling of 66968567 in words is "sixty-six million, nine hundred sixty-eight thousand, five hundred sixty-seven".