818106643 has 2 divisors, whose sum is σ = 818106644. Its totient is φ = 818106642.

The previous prime is 818106599. The next prime is 818106683. The reversal of 818106643 is 346601818.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 818106643 - 2²⁵ = 784552211 is a prime.

It is not a weakly prime, because it can be changed into another prime (818106683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409053321 + 409053322.

It is an arithmetic number, because the mean of its divisors is an integer number (409053322).

Almost surely, 2^818106643 is an apocalyptic number.

818106643 is a deficient number, since it is larger than the sum of its proper divisors (1).

818106643 is an equidigital number, since it uses as much as digits as its factorization.

818106643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 818106643 is about 28602.5635739176. The cubic root of 818106643 is about 935.2692154699.

The spelling of 818106643 in words is "eight hundred eighteen million, one hundred six thousand, six hundred forty-three".