66640720330043 has 2 divisors, whose sum is σ = 66640720330044. Its totient is φ = 66640720330042.

The previous prime is 66640720329979. The next prime is 66640720330061. The reversal of 66640720330043 is 34003302704666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66640720330043 - 2⁶ = 66640720329979 is a prime.

It is a super-2 number, since 2×66640720330043² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66640720329976 and 66640720330003.

It is not a weakly prime, because it can be changed into another prime (66640720320043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33320360165021 + 33320360165022.

It is an arithmetic number, because the mean of its divisors is an integer number (33320360165022).

Almost surely, 2^{66640720330043} is an apocalyptic number.

66640720330043 is a deficient number, since it is larger than the sum of its proper divisors (1).

66640720330043 is an equidigital number, since it uses as much as digits as its factorization.

66640720330043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1306368, while the sum is 44.

The spelling of 66640720330043 in words is "sixty-six trillion, six hundred forty billion, seven hundred twenty million, three hundred thirty thousand, forty-three".