66550442243 has 2 divisors, whose sum is σ = 66550442244. Its totient is φ = 66550442242.

The previous prime is 66550442183. The next prime is 66550442263. The reversal of 66550442243 is 34224405566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66550442243 - 2²⁰ = 66549393667 is a prime.

It is a super-2 number, since 2×66550442243² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66550442243.

It is not a weakly prime, because it can be changed into another prime (66550442263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33275221121 + 33275221122.

It is an arithmetic number, because the mean of its divisors is an integer number (33275221122).

Almost surely, 2^66550442243 is an apocalyptic number.

66550442243 is a deficient number, since it is larger than the sum of its proper divisors (1).

66550442243 is an equidigital number, since it uses as much as digits as its factorization.

66550442243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 691200, while the sum is 41.

The spelling of 66550442243 in words is "sixty-six billion, five hundred fifty million, four hundred forty-two thousand, two hundred forty-three".