842645669 has 2 divisors, whose sum is σ = 842645670. Its totient is φ = 842645668.

The previous prime is 842645621. The next prime is 842645677. The reversal of 842645669 is 966546248.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 574177444 + 268468225 = 23962^2 + 16385^2 .

It is a cyclic number.

It is not a de Polignac number, because 842645669 - 2¹⁶ = 842580133 is a prime.

It is a super-2 number, since 2×842645669² = 1420103446968915122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (842648669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421322834 + 421322835.

It is an arithmetic number, because the mean of its divisors is an integer number (421322835).

Almost surely, 2^842645669 is an apocalyptic number.

It is an amenable number.

842645669 is a deficient number, since it is larger than the sum of its proper divisors (1).

842645669 is an equidigital number, since it uses as much as digits as its factorization.

842645669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2488320, while the sum is 50.

The square root of 842645669 is about 29028.3597366437. The cubic root of 842645669 is about 944.5283496908.

The spelling of 842645669 in words is "eight hundred forty-two million, six hundred forty-five thousand, six hundred sixty-nine".