66542867 has 2 divisors, whose sum is σ = 66542868. Its totient is φ = 66542866.

The previous prime is 66542863. The next prime is 66542869. The reversal of 66542867 is 76824566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66542867 - 2² = 66542863 is a prime.

Together with 66542869, 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 (66542863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33271433 + 33271434.

It is an arithmetic number, because the mean of its divisors is an integer number (33271434).

Almost surely, 2^66542867 is an apocalyptic number.

66542867 is a deficient number, since it is larger than the sum of its proper divisors (1).

66542867 is an equidigital number, since it uses as much as digits as its factorization.

66542867 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 483840, while the sum is 44.

The square root of 66542867 is about 8157.3811361245. The cubic root of 66542867 is about 405.2289859879.

The spelling of 66542867 in words is "sixty-six million, five hundred forty-two thousand, eight hundred sixty-seven".