866409983 has 2 divisors, whose sum is σ = 866409984. Its totient is φ = 866409982.

The previous prime is 866409959. The next prime is 866409989. The reversal of 866409983 is 389904668.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 866409983 - 2⁶ = 866409919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866409989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433204991 + 433204992.

It is an arithmetic number, because the mean of its divisors is an integer number (433204992).

Almost surely, 2^866409983 is an apocalyptic number.

866409983 is a deficient number, since it is larger than the sum of its proper divisors (1).

866409983 is an equidigital number, since it uses as much as digits as its factorization.

866409983 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2239488, while the sum is 53.

The square root of 866409983 is about 29434.8430096034. The cubic root of 866409983 is about 953.3253668490.

The spelling of 866409983 in words is "eight hundred sixty-six million, four hundred nine thousand, nine hundred eighty-three".