404626646609 has 2 divisors, whose sum is σ = 404626646610. Its totient is φ = 404626646608.

The previous prime is 404626646587. The next prime is 404626646759. The reversal of 404626646609 is 906646626404.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 245349827584 + 159276819025 = 495328^2 + 399095^2 .

It is a cyclic number.

It is not a de Polignac number, because 404626646609 - 2¹² = 404626642513 is a prime.

It is not a weakly prime, because it can be changed into another prime (404626646009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202313323304 + 202313323305.

It is an arithmetic number, because the mean of its divisors is an integer number (202313323305).

Almost surely, 2^404626646609 is an apocalyptic number.

It is an amenable number.

404626646609 is a deficient number, since it is larger than the sum of its proper divisors (1).

404626646609 is an equidigital number, since it uses as much as digits as its factorization.

404626646609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8957952, while the sum is 53.

The spelling of 404626646609 in words is "four hundred four billion, six hundred twenty-six million, six hundred forty-six thousand, six hundred nine".