66210240667 has 2 divisors, whose sum is σ = 66210240668. Its totient is φ = 66210240666.

The previous prime is 66210240583. The next prime is 66210240673. The reversal of 66210240667 is 76604201266.

66210240667 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66210240667 is a prime.

It is not a weakly prime, because it can be changed into another prime (66210246667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33105120333 + 33105120334.

It is an arithmetic number, because the mean of its divisors is an integer number (33105120334).

Almost surely, 2^66210240667 is an apocalyptic number.

66210240667 is a deficient number, since it is larger than the sum of its proper divisors (1).

66210240667 is an equidigital number, since it uses as much as digits as its factorization.

66210240667 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 40.

The spelling of 66210240667 in words is "sixty-six billion, two hundred ten million, two hundred forty thousand, six hundred sixty-seven".