66542824567 has 2 divisors, whose sum is σ = 66542824568. Its totient is φ = 66542824566.

The previous prime is 66542824511. The next prime is 66542824573. The reversal of 66542824567 is 76542824566.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66542824567 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66542824967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33271412283 + 33271412284.

It is an arithmetic number, because the mean of its divisors is an integer number (33271412284).

Almost surely, 2^66542824567 is an apocalyptic number.

66542824567 is a deficient number, since it is larger than the sum of its proper divisors (1).

66542824567 is an equidigital number, since it uses as much as digits as its factorization.

66542824567 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19353600, while the sum is 55.

Subtracting 66542824567 from its reverse (76542824566), we obtain a palindrome (9999999999).

The spelling of 66542824567 in words is "sixty-six billion, five hundred forty-two million, eight hundred twenty-four thousand, five hundred sixty-seven".