66430166853709 has 2 divisors, whose sum is σ = 66430166853710. Its totient is φ = 66430166853708.

The previous prime is 66430166853703. The next prime is 66430166853719. The reversal of 66430166853709 is 90735866103466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62046294040809 + 4383872812900 = 7876947^2 + 2093770^2 .

It is a cyclic number.

It is not a de Polignac number, because 66430166853709 - 2¹¹ = 66430166851661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66430166853703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33215083426854 + 33215083426855.

It is an arithmetic number, because the mean of its divisors is an integer number (33215083426855).

Almost surely, 2^{66430166853709} is an apocalyptic number.

It is an amenable number.

66430166853709 is a deficient number, since it is larger than the sum of its proper divisors (1).

66430166853709 is an equidigital number, since it uses as much as digits as its factorization.

66430166853709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 117573120, while the sum is 64.

It can be divided in two parts, 664301 and 66853709, that added together give a triangular number (67518010 = T₁₁₆₂₀).

The spelling of 66430166853709 in words is "sixty-six trillion, four hundred thirty billion, one hundred sixty-six million, eight hundred fifty-three thousand, seven hundred nine".