866453993 has 2 divisors, whose sum is σ = 866453994. Its totient is φ = 866453992.

The previous prime is 866453981. The next prime is 866454037. The reversal of 866453993 is 399354668.

866453993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 790903129 + 75550864 = 28123^2 + 8692^2 .

It is a cyclic number.

It is not a de Polignac number, because 866453993 - 2¹⁰ = 866452969 is a prime.

It is not a weakly prime, because it can be changed into another prime (866453963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433226996 + 433226997.

It is an arithmetic number, because the mean of its divisors is an integer number (433226997).

Almost surely, 2^866453993 is an apocalyptic number.

It is an amenable number.

866453993 is a deficient number, since it is larger than the sum of its proper divisors (1).

866453993 is an equidigital number, since it uses as much as digits as its factorization.

866453993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4199040, while the sum is 53.

The square root of 866453993 is about 29435.5905835096. The cubic root of 866453993 is about 953.3415082215.

The spelling of 866453993 in words is "eight hundred sixty-six million, four hundred fifty-three thousand, nine hundred ninety-three".