20143455209 has 2 divisors, whose sum is σ = 20143455210. Its totient is φ = 20143455208.

The previous prime is 20143455139. The next prime is 20143455247. The reversal of 20143455209 is 90255434102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13121015209 + 7022440000 = 114547^2 + 83800^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20143455209 is a prime.

It is not a weakly prime, because it can be changed into another prime (20143455259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10071727604 + 10071727605.

It is an arithmetic number, because the mean of its divisors is an integer number (10071727605).

Almost surely, 2^20143455209 is an apocalyptic number.

It is an amenable number.

20143455209 is a deficient number, since it is larger than the sum of its proper divisors (1).

20143455209 is an equidigital number, since it uses as much as digits as its factorization.

20143455209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43200, while the sum is 35.

The spelling of 20143455209 in words is "twenty billion, one hundred forty-three million, four hundred fifty-five thousand, two hundred nine".