142565666809 has 4 divisors (see below), whose sum is σ = 142732022004. Its totient is φ = 142399311616.

The previous prime is 142565666807. The next prime is 142565666821. The reversal of 142565666809 is 908666565241.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 121851261184 + 20714405625 = 349072^2 + 143925^2 .

It is a cyclic number.

It is not a de Polignac number, because 142565666809 - 2¹ = 142565666807 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142565666801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83176312 + ... + 83178025.

It is an arithmetic number, because the mean of its divisors is an integer number (35683005501).

Almost surely, 2^142565666809 is an apocalyptic number.

It is an amenable number.

142565666809 is a deficient number, since it is larger than the sum of its proper divisors (166355195).

142565666809 is an equidigital number, since it uses as much as digits as its factorization.

142565666809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166355194.

The product of its (nonzero) digits is 18662400, while the sum is 58.

The spelling of 142565666809 in words is "one hundred forty-two billion, five hundred sixty-five million, six hundred sixty-six thousand, eight hundred nine".