643124544787469 has 2 divisors, whose sum is σ = 643124544787470. Its totient is φ = 643124544787468.

The previous prime is 643124544787441. The next prime is 643124544787519. The reversal of 643124544787469 is 964787445421346.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 501789658038244 + 141334886749225 = 22400662^2 + 11888435^2 .

It is a cyclic number.

It is not a de Polignac number, because 643124544787469 - 2²⁸ = 643124276352013 is a prime.

It is a super-2 number, since 2×643124544787469² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 643124544787396 and 643124544787405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643124544787409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321562272393734 + 321562272393735.

It is an arithmetic number, because the mean of its divisors is an integer number (321562272393735).

Almost surely, 2^{643124544787469} is an apocalyptic number.

It is an amenable number.

643124544787469 is a deficient number, since it is larger than the sum of its proper divisors (1).

643124544787469 is an equidigital number, since it uses as much as digits as its factorization.

643124544787469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3901685760, while the sum is 74.

The spelling of 643124544787469 in words is "six hundred forty-three trillion, one hundred twenty-four billion, five hundred forty-four million, seven hundred eighty-seven thousand, four hundred sixty-nine".