42291666709 has 2 divisors, whose sum is σ = 42291666710. Its totient is φ = 42291666708.

The previous prime is 42291666707. The next prime is 42291666731. The reversal of 42291666709 is 90766619224.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39002300100 + 3289366609 = 197490^2 + 57353^2 .

It is a cyclic number.

It is not a de Polignac number, because 42291666709 - 2¹ = 42291666707 is a prime.

Together with 42291666707, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42291666707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21145833354 + 21145833355.

It is an arithmetic number, because the mean of its divisors is an integer number (21145833355).

Almost surely, 2^42291666709 is an apocalyptic number.

It is an amenable number.

42291666709 is a deficient number, since it is larger than the sum of its proper divisors (1).

42291666709 is an equidigital number, since it uses as much as digits as its factorization.

42291666709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1959552, while the sum is 52.

The spelling of 42291666709 in words is "forty-two billion, two hundred ninety-one million, six hundred sixty-six thousand, seven hundred nine".