66707044409 has 2 divisors, whose sum is σ = 66707044410. Its totient is φ = 66707044408.

The previous prime is 66707044357. The next prime is 66707044423. The reversal of 66707044409 is 90444070766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46223710009 + 20483334400 = 214997^2 + 143120^2 .

It is a cyclic number.

It is not a de Polignac number, because 66707044409 - 2¹⁶ = 66706978873 is a prime.

It is not a weakly prime, because it can be changed into another prime (66707044429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33353522204 + 33353522205.

It is an arithmetic number, because the mean of its divisors is an integer number (33353522205).

Almost surely, 2^66707044409 is an apocalyptic number.

It is an amenable number.

66707044409 is a deficient number, since it is larger than the sum of its proper divisors (1).

66707044409 is an equidigital number, since it uses as much as digits as its factorization.

66707044409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1016064, while the sum is 47.

The spelling of 66707044409 in words is "sixty-six billion, seven hundred seven million, forty-four thousand, four hundred nine".