404386576520909 has 2 divisors, whose sum is σ = 404386576520910. Its totient is φ = 404386576520908.

The previous prime is 404386576520819. The next prime is 404386576520977. The reversal of 404386576520909 is 909025675683404.

It is an a-pointer prime, because the next prime (404386576520977) can be obtained adding 404386576520909 to its sum of digits (68).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 351909272970025 + 52477303550884 = 18759245^2 + 7244122^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-404386576520909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404386576520989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202193288260454 + 202193288260455.

It is an arithmetic number, because the mean of its divisors is an integer number (202193288260455).

Almost surely, 2^{404386576520909} is an apocalyptic number.

It is an amenable number.

404386576520909 is a deficient number, since it is larger than the sum of its proper divisors (1).

404386576520909 is an equidigital number, since it uses as much as digits as its factorization.

404386576520909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 391910400, while the sum is 68.

The spelling of 404386576520909 in words is "four hundred four trillion, three hundred eighty-six billion, five hundred seventy-six million, five hundred twenty thousand, nine hundred nine".