818945669 has 2 divisors, whose sum is σ = 818945670. Its totient is φ = 818945668.

The previous prime is 818945653. The next prime is 818945711. The reversal of 818945669 is 966549818.

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., 798740644 + 20205025 = 28262^2 + 4495^2 .

It is a cyclic number.

It is not a de Polignac number, because 818945669 - 2⁴ = 818945653 is a prime.

It is a super-2 number, since 2×818945669² = 1341344017547715122, 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 (818945629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409472834 + 409472835.

It is an arithmetic number, because the mean of its divisors is an integer number (409472835).

Almost surely, 2^818945669 is an apocalyptic number.

It is an amenable number.

818945669 is a deficient number, since it is larger than the sum of its proper divisors (1).

818945669 is an equidigital number, since it uses as much as digits as its factorization.

818945669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3732480, while the sum is 56.

The square root of 818945669 is about 28617.2267873741. The cubic root of 818945669 is about 935.5888343884.

The spelling of 818945669 in words is "eight hundred eighteen million, nine hundred forty-five thousand, six hundred sixty-nine".