405640424689 has 2 divisors, whose sum is σ = 405640424690. Its totient is φ = 405640424688.

The previous prime is 405640424671. The next prime is 405640424711. The reversal of 405640424689 is 986424046504.

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., 404801337600 + 839087089 = 636240^2 + 28967^2 .

It is a cyclic number.

It is not a de Polignac number, because 405640424689 - 2⁷ = 405640424561 is a prime.

It is not a weakly prime, because it can be changed into another prime (405640424489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202820212344 + 202820212345.

It is an arithmetic number, because the mean of its divisors is an integer number (202820212345).

Almost surely, 2^405640424689 is an apocalyptic number.

It is an amenable number.

405640424689 is a deficient number, since it is larger than the sum of its proper divisors (1).

405640424689 is an equidigital number, since it uses as much as digits as its factorization.

405640424689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6635520, while the sum is 52.

The spelling of 405640424689 in words is "four hundred five billion, six hundred forty million, four hundred twenty-four thousand, six hundred eighty-nine".