66578200624709 has 2 divisors, whose sum is σ = 66578200624710. Its totient is φ = 66578200624708.

The previous prime is 66578200624703. The next prime is 66578200624739. The reversal of 66578200624709 is 90742600287566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38247384695809 + 28330815928900 = 6184447^2 + 5322670^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66578200624709 is a prime.

It is a super-2 number, since 2×66578200624709² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66578200624703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33289100312354 + 33289100312355.

It is an arithmetic number, because the mean of its divisors is an integer number (33289100312355).

Almost surely, 2^{66578200624709} is an apocalyptic number.

It is an amenable number.

66578200624709 is a deficient number, since it is larger than the sum of its proper divisors (1).

66578200624709 is an equidigital number, since it uses as much as digits as its factorization.

66578200624709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60963840, while the sum is 62.

The spelling of 66578200624709 in words is "sixty-six trillion, five hundred seventy-eight billion, two hundred million, six hundred twenty-four thousand, seven hundred nine".