402826660909 has 2 divisors, whose sum is σ = 402826660910. Its totient is φ = 402826660908.

The previous prime is 402826660849. The next prime is 402826660921. The reversal of 402826660909 is 909066628204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 307764205225 + 95062455684 = 554765^2 + 308322^2 .

It is a cyclic number.

It is not a de Polignac number, because 402826660909 - 2²³ = 402818272301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402826660939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201413330454 + 201413330455.

It is an arithmetic number, because the mean of its divisors is an integer number (201413330455).

Almost surely, 2^402826660909 is an apocalyptic number.

It is an amenable number.

402826660909 is a deficient number, since it is larger than the sum of its proper divisors (1).

402826660909 is an equidigital number, since it uses as much as digits as its factorization.

402826660909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2239488, while the sum is 52.

The spelling of 402826660909 in words is "four hundred two billion, eight hundred twenty-six million, six hundred sixty thousand, nine hundred nine".