66543107 has 2 divisors, whose sum is σ = 66543108. Its totient is φ = 66543106.

The previous prime is 66543031. The next prime is 66543109. The reversal of 66543107 is 70134566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66543107 - 2²⁰ = 65494531 is a prime.

Together with 66543109, 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 (66543109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33271553 + 33271554.

It is an arithmetic number, because the mean of its divisors is an integer number (33271554).

Almost surely, 2^66543107 is an apocalyptic number.

66543107 is a deficient number, since it is larger than the sum of its proper divisors (1).

66543107 is an equidigital number, since it uses as much as digits as its factorization.

66543107 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 66543107 is about 8157.3958467148. The cubic root of 66543107 is about 405.2294731667.

The spelling of 66543107 in words is "sixty-six million, five hundred forty-three thousand, one hundred seven".