788666891 has 2 divisors, whose sum is σ = 788666892. Its totient is φ = 788666890.

The previous prime is 788666881. The next prime is 788666897. The reversal of 788666891 is 198666887.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-788666891 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 788666891.

It is not a weakly prime, because it can be changed into another prime (788666897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 394333445 + 394333446.

It is an arithmetic number, because the mean of its divisors is an integer number (394333446).

Almost surely, 2^788666891 is an apocalyptic number.

788666891 is a deficient number, since it is larger than the sum of its proper divisors (1).

788666891 is an equidigital number, since it uses as much as digits as its factorization.

788666891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6967296, while the sum is 59.

The square root of 788666891 is about 28083.2136871833. The cubic root of 788666891 is about 923.9132661446.

The spelling of 788666891 in words is "seven hundred eighty-eight million, six hundred sixty-six thousand, eight hundred ninety-one".