66757572067 has 2 divisors, whose sum is σ = 66757572068. Its totient is φ = 66757572066.

The previous prime is 66757572061. The next prime is 66757572071. The reversal of 66757572067 is 76027575766.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66757572067 is a prime.

It is not a weakly prime, because it can be changed into another prime (66757572061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33378786033 + 33378786034.

It is an arithmetic number, because the mean of its divisors is an integer number (33378786034).

Almost surely, 2^66757572067 is an apocalyptic number.

66757572067 is a deficient number, since it is larger than the sum of its proper divisors (1).

66757572067 is an equidigital number, since it uses as much as digits as its factorization.

66757572067 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25930800, while the sum is 58.

The spelling of 66757572067 in words is "sixty-six billion, seven hundred fifty-seven million, five hundred seventy-two thousand, sixty-seven".